diff --git a/packages/strapi-plugin-i18n/admin/src/components/ModalCreate/BaseForm.js b/packages/strapi-plugin-i18n/admin/src/components/ModalCreate/BaseForm.js
new file mode 100644
index 0000000000..07c8ef5b50
--- /dev/null
+++ b/packages/strapi-plugin-i18n/admin/src/components/ModalCreate/BaseForm.js
@@ -0,0 +1,77 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { Label } from '@buffetjs/core';
+import { Inputs } from '@buffetjs/custom';
+import Select from 'react-select';
+import { Col, Row } from 'reactstrap';
+import { useIntl } from 'react-intl';
+import { useFormikContext } from 'formik';
+import { getTrad } from '../../utils';
+
+const BaseForm = ({ options, defaultOption }) => {
+  const { formatMessage } = useIntl();
+  const { values, handleChange, setFieldValue } = useFormikContext();
+
+  return (
+    <Row>
+      <Col>
+        <span id="locale-code">
+          <Label htmlFor="">
+            {formatMessage({
+              id: getTrad('Settings.locales.modal.locales.label'),
+            })}
+          </Label>
+        </span>
+
+        <Select
+          aria-labelledby="locale-code"
+          options={options}
+          defaultValue={defaultOption}
+          onChange={selection => {
+            setFieldValue('displayName', selection.value);
+            setFieldValue('code', selection.label);
+          }}
+        />
+      </Col>
+
+      <Col>
+        <Inputs
+          label={formatMessage({
+            id: getTrad('Settings.locales.modal.locales.displayName'),
+          })}
+          name="displayName"
+          description={formatMessage({
+            id: getTrad('Settings.locales.modal.locales.displayName.description'),
+          })}
+          type="text"
+          value={values.displayName}
+          onChange={handleChange}
+          validations={{
+            max: 50,
+          }}
+          translatedErrors={{
+            max: formatMessage({
+              id: getTrad('Settings.locales.modal.locales.displayName.error'),
+            }),
+          }}
+        />
+      </Col>
+    </Row>
+  );
+};
+
+BaseForm.defaultProps = {
+  defaultOption: undefined,
+};
+
+BaseForm.propTypes = {
+  options: PropTypes.arrayOf(
+    PropTypes.exact({ value: PropTypes.string.isRequired, label: PropTypes.string.isRequired })
+  ).isRequired,
+  defaultOption: PropTypes.exact({
+    value: PropTypes.string.isRequired,
+    label: PropTypes.string.isRequired,
+  }),
+};
+
+export default BaseForm;
diff --git a/packages/strapi-plugin-i18n/admin/src/components/ModalCreate/index.js b/packages/strapi-plugin-i18n/admin/src/components/ModalCreate/index.js
index 43357c0ccf..1598444fc4 100644
--- a/packages/strapi-plugin-i18n/admin/src/components/ModalCreate/index.js
+++ b/packages/strapi-plugin-i18n/admin/src/components/ModalCreate/index.js
@@ -7,15 +7,40 @@ import { Formik } from 'formik';
 import localeFormSchema from '../../schemas';
 import { getTrad } from '../../utils';
 import SettingsModal from '../SettingsModal';
+import useDefaultLocales from '../../hooks/useDefaultLocales';
+import useAddLocale from '../../hooks/useAddLocale';
+import BaseForm from './BaseForm';
 
 const ModalCreate = ({ onClose, isOpened }) => {
+  const { defaultLocales, isLoading } = useDefaultLocales();
+  const { isAdding, addLocale } = useAddLocale();
   const { formatMessage } = useIntl();
 
+  if (!isOpened) return null;
+
+  if (isLoading) {
+    return (
+      <div>
+        <p>
+          {formatMessage({ id: getTrad('Settings.locales.modal.create.defaultLocales.loading') })}
+        </p>
+      </div>
+    );
+  }
+
+  const options = (defaultLocales || []).map(locale => ({
+    label: locale.code,
+    value: locale.name,
+  }));
+
+  const defaultOption = options[0];
+
   return (
     <Modal isOpen={isOpened} onToggle={onClose}>
       <Formik
-        initialValues={{ displayName: '' }}
-        onSubmit={() => null}
+        initialValues={{ code: defaultOption.label, displayName: defaultOption.value }}
+        onSubmit={values =>
+          addLocale({ code: values.code, name: values.displayName }).then(onClose)}
         validationSchema={localeFormSchema}
       >
         {({ handleSubmit, errors }) => (
@@ -30,7 +55,9 @@ const ModalCreate = ({ onClose, isOpened }) => {
               })}
               tabsId="i18n-settings-tabs-create"
             >
-              <TabPanel>Base form</TabPanel>
+              <TabPanel>
+                <BaseForm options={options} defaultOption={defaultOption} />
+              </TabPanel>
               <TabPanel>advanced</TabPanel>
             </SettingsModal>
 
@@ -42,7 +69,7 @@ const ModalCreate = ({ onClose, isOpened }) => {
                 <Button
                   color="success"
                   type="submit"
-                  isLoading={false}
+                  isLoading={isAdding}
                   disabled={Object.keys(errors).length > 0}
                 >
                   {formatMessage({ id: getTrad('Settings.locales.modal.create.confirmation') })}
diff --git a/packages/strapi-plugin-i18n/admin/src/components/ModalEdit/BaseForm.js b/packages/strapi-plugin-i18n/admin/src/components/ModalEdit/BaseForm.js
index 668c8e47e6..ba93a5c454 100644
--- a/packages/strapi-plugin-i18n/admin/src/components/ModalEdit/BaseForm.js
+++ b/packages/strapi-plugin-i18n/admin/src/components/ModalEdit/BaseForm.js
@@ -33,11 +33,11 @@ const BaseForm = ({ options, defaultOption }) => {
       <Col>
         <Inputs
           label={formatMessage({
-            id: getTrad('Settings.locales.modal.edit.locales.displayName'),
+            id: getTrad('Settings.locales.modal.locales.displayName'),
           })}
           name="displayName"
           description={formatMessage({
-            id: getTrad('Settings.locales.modal.edit.locales.displayName.description'),
+            id: getTrad('Settings.locales.modal.locales.displayName.description'),
           })}
           type="text"
           value={values.displayName}
diff --git a/packages/strapi-plugin-i18n/admin/src/containers/SettingsPage/tests/SettingsPage.test.js b/packages/strapi-plugin-i18n/admin/src/containers/SettingsPage/tests/SettingsPage.test.js
index 42e5ef98be..586ca81403 100644
--- a/packages/strapi-plugin-i18n/admin/src/containers/SettingsPage/tests/SettingsPage.test.js
+++ b/packages/strapi-plugin-i18n/admin/src/containers/SettingsPage/tests/SettingsPage.test.js
@@ -179,13 +179,13 @@ describe('i18n settings page', () => {
       const rowUtils = within(row);
 
       fireEvent.click(rowUtils.getByLabelText('Settings.list.actions.edit'));
-      fireEvent.change(screen.getByLabelText('Settings.locales.modal.edit.locales.displayName'), {
+      fireEvent.change(screen.getByLabelText('Settings.locales.modal.locales.displayName'), {
         target: {
           value:
             'a very very very very long string that has more than fifty characters in order to show a warning',
         },
       });
-      fireEvent.blur(screen.getByLabelText('Settings.locales.modal.edit.locales.displayName'));
+      fireEvent.blur(screen.getByLabelText('Settings.locales.modal.locales.displayName'));
 
       await waitFor(() =>
         expect(screen.getByText('Settings.locales.modal.edit.confirmation')).toBeDisabled()
@@ -341,7 +341,7 @@ describe('i18n settings page', () => {
 
       fireEvent.click(rowUtils.getByLabelText('Settings.list.actions.edit'));
 
-      fireEvent.change(screen.getByLabelText('Settings.locales.modal.edit.locales.displayName'), {
+      fireEvent.change(screen.getByLabelText('Settings.locales.modal.locales.displayName'), {
         target: {
           value: '',
         },
@@ -487,7 +487,17 @@ describe('i18n settings page', () => {
   });
 
   describe('create', () => {
-    // TODO: add the select verifications
+    beforeEach(() => {
+      request.mockImplementation(url =>
+        url.includes('/i18n/locales')
+          ? Promise.resolve([])
+          : Promise.resolve([
+              { code: 'fr-FR', name: 'Francais' },
+              { code: 'en-EN', name: 'English' },
+            ])
+      );
+    });
+
     it('shows the default create modal layout', async () => {
       render(
         <TestWrapper>
@@ -497,7 +507,18 @@ describe('i18n settings page', () => {
 
       fireEvent.click(screen.getByText('Settings.list.actions.add'));
 
-      expect(screen.getByText(`Settings.locales.modal.create.confirmation`)).toBeVisible();
+      expect(
+        screen.getByText(`Settings.locales.modal.create.defaultLocales.loading`)
+      ).toBeVisible();
+
+      await waitFor(() =>
+        expect(screen.getByText(`Settings.locales.modal.create.confirmation`)).toBeVisible()
+      );
+
+      expect(screen.getByText(`fr-FR`)).toBeVisible();
+      expect(screen.getByLabelText('Settings.locales.modal.locales.displayName')).toHaveValue(
+        'Francais'
+      );
     });
 
     it('closes the create modal when clicking on cancel', async () => {
@@ -508,9 +529,142 @@ describe('i18n settings page', () => {
       );
 
       fireEvent.click(screen.getByText('Settings.list.actions.add'));
+
+      await waitFor(() =>
+        expect(screen.getByText(`Settings.locales.modal.create.confirmation`)).toBeVisible()
+      );
+
       fireEvent.click(screen.getByText('app.components.Button.cancel'));
 
       expect(screen.queryByText(`Settings.locales.modal.create.confirmation`)).toBeFalsy();
     });
+
+    it('shows a warning and disabled the confirmation button when display name length is over 50', async () => {
+      render(
+        <TestWrapper>
+          <LocaleSettingsPage />
+        </TestWrapper>
+      );
+
+      fireEvent.click(screen.getByText('Settings.list.actions.add'));
+
+      await waitFor(() =>
+        expect(screen.getByText(`Settings.locales.modal.create.confirmation`)).toBeVisible()
+      );
+
+      fireEvent.change(screen.getByLabelText('Settings.locales.modal.locales.displayName'), {
+        target: {
+          value:
+            'a very very very very long string that has more than fifty characters in order to show a warning',
+        },
+      });
+
+      fireEvent.blur(screen.getByLabelText('Settings.locales.modal.locales.displayName'));
+
+      await waitFor(() =>
+        expect(screen.getByText(`Settings.locales.modal.locales.displayName.error`)).toBeVisible()
+      );
+    });
+
+    it('sync the select and the text input', async () => {
+      render(
+        <TestWrapper>
+          <LocaleSettingsPage />
+        </TestWrapper>
+      );
+
+      fireEvent.click(screen.getByText('Settings.list.actions.add'));
+
+      await waitFor(() =>
+        expect(screen.getByText(`Settings.locales.modal.create.confirmation`)).toBeVisible()
+      );
+
+      // Put some data in the input in order to make sure it resets well when changing locale
+      fireEvent.change(screen.getByLabelText('Settings.locales.modal.locales.displayName'), {
+        target: {
+          value:
+            'a very very very very long string that has more than fifty characters in order to show a warning',
+        },
+      });
+
+      const DOWN_ARROW = { keyCode: 40 };
+      fireEvent.keyDown(screen.getByLabelText('Settings.locales.modal.locales.label'), DOWN_ARROW);
+
+      fireEvent.click(screen.getByText('en-EN'));
+
+      expect(screen.getByLabelText('Settings.locales.modal.locales.displayName')).toHaveValue(
+        'English'
+      );
+    });
+
+    it('shows an error when something went wrong when adding a locale', async () => {
+      request.mockImplementation((url, opts) => {
+        if (opts.method === 'POST') {
+          return Promise.reject(new Error('Something went wrong when adding a locale'));
+        }
+        if (url.includes('/i18n/locales')) return Promise.resolve([]);
+
+        return Promise.resolve([
+          { code: 'fr-FR', name: 'Francais' },
+          { code: 'en-EN', name: 'English' },
+        ]);
+      });
+
+      render(
+        <TestWrapper>
+          <LocaleSettingsPage />
+        </TestWrapper>
+      );
+
+      fireEvent.click(screen.getByText('Settings.list.actions.add'));
+
+      const confirmationButton = await waitFor(() =>
+        screen.getByText(`Settings.locales.modal.create.confirmation`)
+      );
+
+      fireEvent.click(confirmationButton);
+
+      await waitFor(() =>
+        expect(strapi.notification.toggle).toBeCalledWith({
+          type: 'warning',
+          message: { id: 'notification.error' },
+        })
+      );
+    });
+
+    it('shows an success toast when adding a locale is successful', async () => {
+      request.mockImplementation((url, opts) => {
+        if (opts.method === 'POST') {
+          return Promise.resolve({ id: 3, code: 'en-CA', name: 'Canadien' });
+        }
+        if (url.includes('/i18n/locales')) return Promise.resolve([]);
+
+        return Promise.resolve([
+          { code: 'fr-FR', name: 'Francais' },
+          { code: 'en-EN', name: 'English' },
+        ]);
+      });
+
+      render(
+        <TestWrapper>
+          <LocaleSettingsPage />
+        </TestWrapper>
+      );
+
+      fireEvent.click(screen.getByText('Settings.list.actions.add'));
+
+      const confirmationButton = await waitFor(() =>
+        screen.getByText(`Settings.locales.modal.create.confirmation`)
+      );
+
+      fireEvent.click(confirmationButton);
+
+      await waitFor(() =>
+        expect(strapi.notification.toggle).toBeCalledWith({
+          type: 'success',
+          message: { id: 'Settings.locales.modal.create.success' },
+        })
+      );
+    });
   });
 });
diff --git a/packages/strapi-plugin-i18n/admin/src/hooks/useAddLocale/index.js b/packages/strapi-plugin-i18n/admin/src/hooks/useAddLocale/index.js
new file mode 100644
index 0000000000..18ea5d788a
--- /dev/null
+++ b/packages/strapi-plugin-i18n/admin/src/hooks/useAddLocale/index.js
@@ -0,0 +1,41 @@
+import { request } from 'strapi-helper-plugin';
+import { useMutation, useQueryClient } from 'react-query';
+import { getTrad } from '../../utils';
+
+const addLocale = async ({ code, name }) => {
+  try {
+    const data = await request(`/i18n/locales`, {
+      method: 'POST',
+      body: {
+        name,
+        code,
+      },
+    });
+
+    strapi.notification.toggle({
+      type: 'success',
+      message: { id: getTrad('Settings.locales.modal.create.success') },
+    });
+
+    return data;
+  } catch (e) {
+    strapi.notification.toggle({
+      type: 'warning',
+      message: { id: 'notification.error' },
+    });
+
+    return e;
+  }
+};
+
+const useAddLocale = () => {
+  const queryClient = useQueryClient();
+
+  const { isLoading, mutateAsync } = useMutation(addLocale, {
+    onSuccess: data => queryClient.setQueryData(['locales', { id: data.id }], data),
+  });
+
+  return { isAdding: isLoading, addLocale: mutateAsync };
+};
+
+export default useAddLocale;
diff --git a/packages/strapi-plugin-i18n/admin/src/schemas.js b/packages/strapi-plugin-i18n/admin/src/schemas.js
index 70cbf8af7e..86e5a1c165 100644
--- a/packages/strapi-plugin-i18n/admin/src/schemas.js
+++ b/packages/strapi-plugin-i18n/admin/src/schemas.js
@@ -1,7 +1,7 @@
 import { object, string } from 'yup';
 
 const localeFormSchema = object().shape({
-  displayName: string().max(50, 'Settings.locales.modal.create.locales.displayName.error'),
+  displayName: string().max(50, 'Settings.locales.modal.locales.displayName.error'),
 });
 
 export default localeFormSchema;
diff --git a/packages/strapi-plugin-i18n/admin/src/translations/en.json b/packages/strapi-plugin-i18n/admin/src/translations/en.json
index 47099e4bf6..bb527495c9 100644
--- a/packages/strapi-plugin-i18n/admin/src/translations/en.json
+++ b/packages/strapi-plugin-i18n/admin/src/translations/en.json
@@ -30,18 +30,15 @@
   "Settings.locales.modal.delete.success": "Locale successfully deleted",
   "Settings.locales.modal.edit.confirmation": "Finish",
   "Settings.locales.modal.edit.success": "Locale successfully edited",
-  "Settings.locales.modal.edit.locales.label": "Locales",
-  "Settings.locales.modal.edit.locales.displayName": "Locale display name",
-  "Settings.locales.modal.edit.locales.displayName.description":"Locale will be displayed under that name in the administration panel",
   "Settings.locales.modal.edit.tab.label":"Navigating between the I18N base settings and advanced settings",
   "Settings.locales.modal.base": "Base settings",
   "Settings.locales.modal.advanced": "Advanced settings",
-
+  "Settings.locales.modal.create.defaultLocales.loading": "Loading the available locales...",
   "Settings.locales.modal.create.confirmation": "Add locale",
   "Settings.locales.modal.create.success": "Locale successfully added",
-  "Settings.locales.modal.create.locales.label": "Locales",
-  "Settings.locales.modal.create.locales.displayName": "Locale display name",
+  "Settings.locales.modal.locales.label": "Locales",
+  "Settings.locales.modal.locales.displayName": "Locale display name",
   "Settings.locales.modal.locales.displayName.error": "The locale display name can only be less than 50 characters.",
-  "Settings.locales.modal.create.locales.displayName.description":"Locale will be displayed under that name in the administration panel",
+  "Settings.locales.modal.locales.displayName.description":"Locale will be displayed under that name in the administration panel",
   "Settings.locales.modal.create.tab.label":"Navigating between the I18N base settings and advanced settings"
 }