Manchester United boss Louis van Gaal admits he's unlikely to see the best of Anthony Martial.

For victory over Stoke City, Martial finished a stunning goal reminiscent of past United teams in the 23rd minute and Van Gaal cannot believe the consistency of his performances.

"It is very much surprising," the United manager said.

"You come from the French league, come to the Premier League and you do this at 20 then you have a lot of potential to give but then I am the manager not any more at that time when he is at his best."