Manchester United manager Erik ten Hag expressed concern over Lisandro Martinez's knee injury, which occurred in the 3-0 win against West Ham. Martinez had only recently returned from a long-term foot injury and his setback is considered a personal disaster for both him and the team. Ten Hag praised the young players who stepped up in Martinez's absence, including the young strikers. Martinez's injury is significant as the team has struggled without him in the past, but they managed to secure a run of wins following his return.