diff --git a/loko/contracts/services_teams.py b/loko/contracts/services_teams.py
index b019ae5..2f75876 100644
--- a/loko/contracts/services_teams.py
+++ b/loko/contracts/services_teams.py
@@ -94,8 +94,12 @@ def set_member_team_schedule(
     # 2. Clôturer ou ajuster l'historique courant (actif à target_date)
     if current_at_target:
         if current_at_target.join_date == target_date:
-            current_at_target.leave_date = target_date
-            current_at_target.save(update_fields=['leave_date'])
+            if target_date > today or team_id is None:
+                # Sur une date future ou lors d'une désassignation, on supprime directement l'affectation du jour
+                current_at_target.delete()
+            else:
+                current_at_target.leave_date = target_date
+                current_at_target.save(update_fields=['leave_date'])
         else:
             # L'historique commençait avant target_date : on le clôture la veille
             prev_leave = target_date - timedelta(days=1)
diff --git a/loko/contracts/templates/contracts/teams_index.html b/loko/contracts/templates/contracts/teams_index.html
index ee67264..26195c9 100644
--- a/loko/contracts/templates/contracts/teams_index.html
+++ b/loko/contracts/templates/contracts/teams_index.html
@@ -1718,8 +1718,6 @@ function filterSidebarMembers() {
 }
 
 function unassignMemberFromDate(memberId, dateStr) {
-    if (!confirm("{% trans 'Désassigner ce membre à partir de cette date ?'|escapejs %}")) return;
-
     postJSON(
         '/contracts/teams/planning/assign/',
         {
diff --git a/loko/contracts/test_planning.py b/loko/contracts/test_planning.py
index fe73397..c09a1f8 100644
--- a/loko/contracts/test_planning.py
+++ b/loko/contracts/test_planning.py
@@ -264,3 +264,62 @@ class TeamPlanningAjaxViewsTests(TestCase):
         self.assertEqual(resp_dup.status_code, 400)
         self.assertIn('passé', resp_dup.json().get('error', '').lower())
 
+    def test_reassign_future_member_to_same_team_as_previous_day(self):
+        """
+        Vérifie qu'un membre présent dans Team 1 le vendredi (J) et Team 2 le samedi (J+1)
+        peut être replanifié dans Team 1 le samedi (J+1).
+        """
+        today = timezone.now().date()
+        friday = today + timedelta(days=2)
+        saturday = today + timedelta(days=3)
+
+        # 1. Vendredi dans Team A, Samedi dans Team B
+        set_member_team_schedule(self.member_alice, self.team_a.id, friday)
+        set_member_team_schedule(self.member_alice, self.team_b.id, saturday)
+
+        comp1 = get_teams_composition_for_period({self.team_a.id, self.team_b.id}, friday, saturday)
+        self.assertIn(self.member_alice.id, [m['id'] for m in comp1.get((self.team_a.id, friday), [])])
+        self.assertIn(self.member_alice.id, [m['id'] for m in comp1.get((self.team_b.id, saturday), [])])
+
+        # 2. Replanifier Alice dans Team A le samedi via AJAX
+        url = reverse('contracts:team_planning_assign_member_ajax')
+        resp = self.client.post(url, data=json.dumps({
+            'member_id': self.member_alice.id,
+            'team_id': self.team_a.id,
+            'date': saturday.isoformat(),
+        }), content_type='application/json')
+        self.assertEqual(resp.status_code, 200)
+
+        # 3. Vérifier la composition : Alice est dans Team A le vendredi ET le samedi
+        comp2 = get_teams_composition_for_period({self.team_a.id, self.team_b.id}, friday, saturday)
+        team_a_friday = [m['id'] for m in comp2.get((self.team_a.id, friday), [])]
+        team_a_saturday = [m['id'] for m in comp2.get((self.team_a.id, saturday), [])]
+        team_b_saturday = [m['id'] for m in comp2.get((self.team_b.id, saturday), [])]
+
+        self.assertIn(self.member_alice.id, team_a_friday)
+        self.assertIn(self.member_alice.id, team_a_saturday)
+        self.assertNotIn(self.member_alice.id, team_b_saturday)
+
+    def test_unassign_member_for_specific_date(self):
+        """Vérifie que la désassignation supprime le membre uniquement pour la date cliquée."""
+        today = timezone.now().date()
+        target_d = today + timedelta(days=2)
+
+        # 1. Assigner Alice sur target_d
+        set_member_team_schedule(self.member_alice, self.team_a.id, target_d)
+        comp1 = get_teams_composition_for_period({self.team_a.id}, target_d, target_d)
+        self.assertIn(self.member_alice.id, [m['id'] for m in comp1.get((self.team_a.id, target_d), [])])
+
+        # 2. Désassigner Alice pour target_d (team_id=None)
+        url = reverse('contracts:team_planning_assign_member_ajax')
+        resp = self.client.post(url, data=json.dumps({
+            'member_id': self.member_alice.id,
+            'team_id': None,
+            'date': target_d.isoformat(),
+        }), content_type='application/json')
+        self.assertEqual(resp.status_code, 200)
+
+        # 3. Vérifier que la cellule est désormais vide
+        comp2 = get_teams_composition_for_period({self.team_a.id}, target_d, target_d)
+        self.assertNotIn(self.member_alice.id, [m['id'] for m in comp2.get((self.team_a.id, target_d), [])])
+