Manchester United manager Louis van Gaal admits he doesn't know what Anthony Martial's best position is yet.
The 19-year-old French international has scored five times for the Reds, but has found himself playing out left in recent games with Wayne Rooney up front, something that has frustrated the club's supporters.
The Dutchman said: "He played always in Monaco as a left winger and I have to see what is the best balance in the team. We have played him in the striker's position, but in Monaco he played more or less at the left-wing."