Manchester United boss Louis van Gaal says Angel di Maria must adjust to his tactics.

Van Gaal is demanding a massive improvement from the South American star and "a change of behaviour."

Before Sunday's fourth vs third home game against Arsenal, he said: "The players have had to adapt to the philosophy and Di Maria has to do that.

"He can still do that, of course, because every player can, but it's important that he wants to do that in his head. When you are open to coaching, then you can change. But a change of behaviour is very difficult.

"Always, the old errors are coming back, so a change of behaviour is not so easy. So we have to wait and see.

"It's not that Di Maria doesn't have the quality. He has to perform in a way that we want. Not in the way I want, but in the way we want as a club."