diff --git a/src/pages/EventDetail/components/AssignUserBtn/AssignUserBtn.tsx b/src/pages/EventDetail/components/AssignUserBtn/AssignUserBtn.tsx
index 44bdaeb..9a9ad3d 100644
--- a/src/pages/EventDetail/components/AssignUserBtn/AssignUserBtn.tsx
+++ b/src/pages/EventDetail/components/AssignUserBtn/AssignUserBtn.tsx
@@ -7,6 +7,8 @@ import Loading from "../../../../components/ui/Loading/Loading";
 import getUserById from "../../../../utils/users/getUserById";
 import styles from "./AssignUserBtn.module.css";
 import {AuthContext} from "../../../../contexts/Auth/AuthContext";
+import assignOtherUser from "../../../../utils/tasks/assignOtherUser";
+import unAssignOtherUser from "../../../../utils/tasks/unAssignOtherUser";
 
 interface AssignUserBtnProps {
     taskId: string | number;
@@ -50,8 +52,17 @@ export default function AssignUserBtn({ taskId }: AssignUserBtnProps): ReactNode
         })();
     }, []);
 
-    const handleAssign = async (user: User) => {
+    const isUserAssigned = (u: User): boolean =>
+        u.tasks.some(t => t.id === taskId);
 
+    const handleAssign = async (selectedUser: User) => {
+        await assignOtherUser(taskId as number, selectedUser.id);
+        setOpen(false);
+    };
+
+    const handleUnassign = async (selectedUser: User) => {
+        await unAssignOtherUser(taskId as number, selectedUser.id);
+        setOpen(false);
     };
 
     return <>
@@ -65,9 +76,15 @@ export default function AssignUserBtn({ taskId }: AssignUserBtnProps): ReactNode
                             {user.name} {user.lastname}
                         </p>
 
-                        <Button onClick={() => handleAssign(user)}>
-                            Assigner
-                        </Button>
+                        {isUserAssigned(user) ? (
+                            <Button variant={"danger"} onClick={() => handleUnassign(user)}>
+                                Désassigner
+                            </Button>
+                        ) : (
+                            <Button onClick={() => handleAssign(user)}>
+                                Assigner
+                            </Button>
+                        )}
                     </div>
                 ))}
             </div>
diff --git a/src/utils/tasks/assignOtherUser.ts b/src/utils/tasks/assignOtherUser.ts
new file mode 100644
index 0000000..189c06b
--- /dev/null
+++ b/src/utils/tasks/assignOtherUser.ts
@@ -0,0 +1,13 @@
+import fetchWrapper from "../fetchWrapper.js";
+import getXSRFToken from "../getXSRF.js";
+
+export default async function assignOtherUser(taskId: number, userId: number): Promise<any> {
+    const csrfToken = await getXSRFToken();
+
+    return fetchWrapper(
+        `/api/events/task/assign/${userId}`,
+        {task_id: taskId},
+        "POST",
+        {"X-XSRF-TOKEN": csrfToken}
+    );
+}
diff --git a/src/utils/tasks/unAssignOtherUser.ts b/src/utils/tasks/unAssignOtherUser.ts
new file mode 100644
index 0000000..0781dca
--- /dev/null
+++ b/src/utils/tasks/unAssignOtherUser.ts
@@ -0,0 +1,13 @@
+import fetchWrapper from "../fetchWrapper.js";
+import getXSRFToken from "../getXSRF.js";
+
+export default async function unAssignOtherUser(taskId: number, userId: number): Promise<any> {
+    const csrfToken = await getXSRFToken();
+
+    return fetchWrapper(
+        `/api/events/task/unassign/${userId}`,
+        {task_id: taskId},
+        "POST",
+        {"X-XSRF-TOKEN": csrfToken}
+    );
+}
\ No newline at end of file