diff --git a/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.html b/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.html
index f9c4a5cb7..2b0b1a1fc 100644
--- a/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.html
+++ b/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.html
@@ -17,7 +17,7 @@
 
         <div class="dialog-actions">
             <iqser-icon-button
-                [disabled]="!form.valid || !changed"
+                [disabled]="!form.valid || !changed || !validOption"
                 [label]="'assign-owner.dialog.save' | translate"
                 [submit]="true"
                 [type]="iconButtonTypes.primary"
diff --git a/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts b/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts
index bb7a46ba2..31554c994 100644
--- a/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts
+++ b/apps/red-ui/src/app/modules/shared-dossiers/dialogs/assign-reviewer-approver-dialog/assign-reviewer-approver-dialog.component.ts
@@ -66,6 +66,11 @@ export class AssignReviewerApproverDialogComponent extends IqserDialogComponent<
         return false;
     }
 
+    get validOption() {
+        const currentUser = this.form.get('user').value;
+        return !!this.userOptions.find(u => u === currentUser);
+    }
+
     get #mode() {
         const isUnderApproval = this.data.targetStatus === WorkflowFileStatuses.UNDER_APPROVAL;
         const isApproved = this.data.targetStatus === WorkflowFileStatuses.APPROVED;