Manchester United could be without the services of Noussair Mazraoui for Saturday's clash with Brentford .
Mazraoui was not pictured training with the Red Devils on Thursday, leading to suggestions that the Morocco international has suffered a fitness problem which could rule him out of this weekend's Premier League clash.
Sam Mather was instead drafted into the first-team training group, with the Englishman being used as a right-sided wing-back in the drills, being a natural replacement for Mazraoui when it came to the exercises.
There has been no official confirmation from Man United regarding a potential injury, but his apparent absence from Thursday's session does suggest that he is carrying a knock.
Red Devils head coach Ruben Amorim will be asked about the situation