diff --git a/src/pages/Plan/modals/SendRequestModal.tsx b/src/pages/Plan/modals/SendRequestModal.tsx
index b9ab8cae2..b562adca1 100644
--- a/src/pages/Plan/modals/SendRequestModal.tsx
+++ b/src/pages/Plan/modals/SendRequestModal.tsx
@@ -40,7 +40,8 @@ const SendRequestModal = ({
   const { planId } = useParams();
   const { planComposedStatus, plan } = usePlan(planId);
   const { t } = useTranslation();
-  const [updateWatchers] = usePutPlansByPidWatchersMutation();
+  const [updateWatchers, { isLoading: isUpdatingWatchers }] =
+    usePutPlansByPidWatchersMutation();
   const { isRequestingQuote, handleQuoteRequest } = useRequestQuotation();
   const { data, isLoading } = useGetPlansByPidRulesEvaluationQuery({
     pid: planId || '',
@@ -230,7 +231,7 @@ const SendRequestModal = ({
             </FooterItem>
             <FooterItem>
               <Button
-                disabled={watchers.length === 0}
+                disabled={watchers.length === 0 || isUpdatingWatchers}
                 isAccent
                 isPrimary
                 onClick={handleConfirm}
diff --git a/tests/e2e/plan/confirm_button_disabled.spec.ts b/tests/e2e/plan/confirm_button_disabled.spec.ts
new file mode 100644
index 000000000..78c040228
--- /dev/null
+++ b/tests/e2e/plan/confirm_button_disabled.spec.ts
@@ -0,0 +1,107 @@
+import { expect, test } from '../../fixtures/app';
+import { PlanPage } from '../../fixtures/pages/Plan';
+import { RequestQuotationModal } from '../../fixtures/pages/Plan/RequestQuotationModal';
+
+test.describe('The confirm button should be disabled while the API call is in progress', () => {
+  let planPage: PlanPage;
+
+  test.beforeEach(async ({ page }) => {
+    planPage = new PlanPage(page);
+    await planPage.loggedIn();
+    await planPage.mockPreferences();
+    await planPage.mockWorkspace();
+    await planPage.mockWorkspacesList();
+  });
+
+  test('confirm button in header is disabled after click until mutation resolves', async ({
+    page,
+  }) => {
+    await planPage.mockGetPendingReviewPlan_WithQuote();
+
+    // Mock PATCH status with a delay to observe the disabled state
+    await page.route('*/**/api/plans/1/status', async (route) => {
+      if (route.request().method() === 'PATCH') {
+        await new Promise<void>((resolve) => {
+          setTimeout(resolve, 1000);
+        });
+        await route.fulfill({
+          status: 200,
+          json: { status: 'approved' },
+        });
+      } else {
+        await route.fallback();
+      }
+    });
+
+    await planPage.open();
+
+    const confirmButton = planPage.elements().confirmActivityCTA();
+    await expect(confirmButton).toBeEnabled();
+
+    await confirmButton.click();
+    await expect(confirmButton).toBeDisabled();
+  });
+});
+
+test.describe('The confirm button in SendRequestModal should be disabled while the API call is in progress', () => {
+  let planPage: PlanPage;
+  let requestQuotationModal: RequestQuotationModal;
+
+  test.beforeEach(async ({ page }) => {
+    planPage = new PlanPage(page);
+    requestQuotationModal = new RequestQuotationModal(page);
+    await planPage.loggedIn();
+    await planPage.mockPreferences();
+    await planPage.mockWorkspace();
+    await planPage.mockWorkspacesList();
+    await planPage.mockWorkspaceUsers();
+    await planPage.mockGetDraftWithOnlyMandatoryModulesPlan();
+    await planPage.mockPatchPlan();
+  });
+
+  test('submit button in modal is disabled after click until mutation resolves', async ({
+    page,
+  }) => {
+    // Mock PUT watchers with a delay so the button stays visible and disabled
+    await page.route('*/**/api/plans/1/watchers*', async (route) => {
+      if (route.request().method() === 'GET') {
+        await route.fulfill({
+          path: 'tests/api/plans/pid/watchers/_get/200_Example_1.json',
+        });
+      } else if (route.request().method() === 'PUT') {
+        await new Promise<void>((resolve) => {
+          setTimeout(resolve, 1000);
+        });
+        await route.fulfill({
+          status: 200,
+          body: JSON.stringify({}),
+        });
+      } else {
+        await route.fallback();
+      }
+    });
+
+    // Mock PATCH status (will be called after watchers resolve)
+    await page.route('*/**/api/plans/1/status', async (route) => {
+      if (route.request().method() === 'PATCH') {
+        await route.fulfill({
+          status: 200,
+          json: { status: 'pending_review' },
+        });
+      } else {
+        await route.fallback();
+      }
+    });
+
+    await planPage.open();
+
+    // Click request quotation to open the modal
+    await planPage.elements().requestQuotationCTA().click();
+
+    const submitButton = requestQuotationModal.elements().submitCTA();
+    await expect(submitButton).toBeEnabled();
+
+    await submitButton.click();
+    await expect(submitButton).toBeDisabled();
+  });
+});