Manchester United boss Jose Mourinho wants Anthony Martial to raise his game.
The United chief fears that his chaotic personal life is starting to affect his performances on the field.
A United source told The Sun: “Standards have been raised under Jose and he wants his players to be focused on United.
“Martial is going through a tough time off the pitch, but it's down to him to sort it out. The manager's made him well aware of that."
Last summer's £36m signing from Monaco has been substituted in United's opening three fixtures.