Anthony Martial has been played primarily on the left wing for Manchester United, but Louis van Gaal has declared his best position is as a center-forward.

Van Gaal has been using captain Wayne Rooney as his out-and-out striker.

"What is his best position?" Van Gaal asked. "I think his best position is the striker's position but he has to develop himself well. He is very young but I think it is better to develop him in the striker's position than the left winger's position.

"It is not that I have said his best position is the left winger's position but he can play three positions, in his eyes, and that is left, and No. 10 and striker. He doesn't want to play No. 7 [as a right winger]. I am convinced he can do that also but that is another story."

Van Gaal said Martial is being used on the left because it is in the team's best interests.

"I am always thinking in the benefit of the team and not in the benefit of one player," he added. "I have to make decisions always dependable on the gameplan, the opponent and where are the weaknesses of the opponent and so on and so on."