Manchester United boss Louis van Gaal has confirmed defender Marcos Rojo dislocated his shoulder during Sunday's 1-0 derby defeat to Manchester City.
Rojo had to be stretchered off in the second half following a sliding tackle and was replaced by Paddy McNair.
Van Gaal tells #MUTV: "Marcos Rojo has gone to the hospital. His shoulder was out. I don't think he can play against Crystal Palace." #mufc
- Manchester United (@ManUtd) November 2, 2014
"The shoulder is out, you never know how long that will take, I have to wait until tomorrow I think but he shall not play against Crystal Palace," he told Sky Sports. "We have a lot of injuries in defence but you have seen how Michael Carrick and Paddy McNair came in. I don't think that is the problem.
"We still have 11 players to play and also very good players, so I don't cry for that but it is sometimes difficult to select the best team, but I think i can manage that and we are close, you can see it every week, but you need more points.
"I see the fans are applauding after the game, so they see also that the boys are willing to give everything for the shirt of the club."
United will also be without Chris Smalling for Saturday's game at home to Crystal Palace as he picked up a one-match suspension after his dismissal during the derby, while Phil Jones is also on the sidelines with shin splints.
The Red Devils' next game after that is against Arsenal on Nov. 22.