diff --git a/rota_generator/shifts.py b/rota_generator/shifts.py
index 6bb9b3b..b2bf2f6 100644
--- a/rota_generator/shifts.py
+++ b/rota_generator/shifts.py
@@ -1702,6 +1702,103 @@ class RotaBuilder(object):
                         )
 
                     for week in weeks_to_apply:
+                        # If the worker has any forced assignment in the dependency group,
+                        # emit a concise warning. For visibility include every day in the
+                        # group showing the worker's forced shifts (if any) and other
+                        # workers' forced shifts on those days so blocking days are visible.
+                        worker_has_forced_in_group = False
+                        for (fw, fd, fs) in getattr(worker, "forced_assignments", []):
+                            if fw == week and fd in day_group:
+                                worker_has_forced_in_group = True
+                                break
+                        if not worker_has_forced_in_group:
+                            try:
+                                for (d_date, d_shift) in getattr(worker, "forced_assignments_by_date", []):
+                                    ww, dd = self.date_week_day_map.get(d_date, (None, None))
+                                    if ww == week and dd in day_group:
+                                        worker_has_forced_in_group = True
+                                        break
+                            except Exception:
+                                pass
+
+                        if worker_has_forced_in_group:
+                            forced_day_details = []
+                            try:
+                                date_map_for_week = {self.get_date_by_week_day(week, d): d for d in day_group}
+                            except Exception:
+                                date_map_for_week = {}
+
+                            for day in day_group:
+                                worker_forced_shifts = set()
+                                # week-based forced assignments
+                                for (fw, fd, fs) in getattr(worker, "forced_assignments", []):
+                                    if fw == week and fd == day:
+                                        worker_forced_shifts.add(fs)
+                                # date-based forced assignments
+                                try:
+                                    date = self.get_date_by_week_day(week, day)
+                                    for (d_date, d_shift) in getattr(worker, "forced_assignments_by_date", []):
+                                        try:
+                                            ww, dd = self.date_week_day_map.get(d_date, (None, None))
+                                        except Exception:
+                                            ww = dd = None
+                                        if ww == week and dd == day:
+                                            worker_forced_shifts.add(d_shift)
+                                        else:
+                                            try:
+                                                if str(d_date) == str(date):
+                                                    worker_forced_shifts.add(d_shift)
+                                            except Exception:
+                                                pass
+                                except Exception:
+                                    pass
+
+                                # collect other workers' forced shifts on this day
+                                others_forced = {}
+                                try:
+                                    date_for_day = self.get_date_by_week_day(week, day)
+                                except Exception:
+                                    date_for_day = None
+
+                                for other in self.workers:
+                                    if other is worker:
+                                        continue
+                                    other_shifts = set()
+                                    # week-based forced assignments
+                                    for (ofw, ofd, ofs) in getattr(other, "forced_assignments", []):
+                                        if ofw == week and ofd == day:
+                                            other_shifts.add(ofs)
+                                    # date-based forced assignments: try mapping then fallback
+                                    for (odate, oshift) in getattr(other, "forced_assignments_by_date", []):
+                                        try:
+                                            oww, odd = self.date_week_day_map.get(odate, (None, None))
+                                        except Exception:
+                                            oww = odd = None
+                                        if oww == week and odd == day:
+                                            other_shifts.add(oshift)
+                                            continue
+                                        try:
+                                            if date_for_day is not None and str(odate) == str(date_for_day):
+                                                other_shifts.add(oshift)
+                                        except Exception:
+                                            pass
+
+                                    if other_shifts:
+                                        others_forced[other.name] = sorted(list(other_shifts))
+
+                                forced_day_details.append((day, sorted(list(worker_forced_shifts)), others_forced))
+
+                            parts = []
+                            for d, wfs, others in forced_day_details:
+                                olist = ", ".join([f"{n}: {', '.join(s)}" for n, s in others.items()]) or "none"
+                                wfs_str = ", ".join(wfs) or "none"
+                                parts.append(f"{d} - worker forced: {wfs_str}; others forced: {olist}")
+                            details = "; ".join(parts)
+                            logger.warning(f"HardDayDependency forced-assignment warning for worker={worker.name} week={week}: {details}")
+                            self.add_warning(
+                                "HardDayDependency forced assignment",
+                                f"Worker '{worker.name}' has hard_day_dependency {set(day_group)} in week {week}; forced assignments on dependency days: {details}. If the rota is not infeasible this is unlikely to be an issue.",
+                            )
                         assigned_any_shift = {}
                         for day in day_group:
                             shifts_today = self.get_shift_names_by_week_day(week, day)