Louis van Gaal admits he is extremely worried about the number of injuries his Manchester United players are suffering.
Van Gaal will be without nine senior players for Sunday's match against QPR due to injury.
The treatment room was even busier before the international break, when Luke Shaw and Rafael were also out.
Van Gaal's predecessor David Moyes had to do without key players at times last year and the Dutchman is worried about the trend.
"This is a big concern, you are right, I think," the United manager said when it was put to him that United had suffered a lot of injuries in recent years.
Ashley Young was the latest first-team player to join the injury list this week when he suffered a groin problem.
Van Gaal demands a high level of intensity from his players in training, but the former Bayern Munich manager appears unwilling to reduce the workload on his squad.
"We have to evaluate how we train, but for the level I demand as a coach we need to train like that," said Van Gaal, who often puts his players through double sessions.
"But the players have to adapt to that level and that's the crucial thing.
"Because we have to grow and develop ourselves to the top of this sport, the Premier League.
"But I am always evaluating myself. That philosophy has brought a lot of titles, I'm sorry to say that."