Marcus Rashford was not included in Manchester United’s squad for the game at Fulham.
The England striker was forced to apologise to United boss Erik ten Hag after attending a nightclub party following last weekend’s embarrassing derby defeat to Manchester City.
But Rashford was missing at Craven Cottage due to injury after taking a “heavy knock” in training.
Reports emerged the day after the City match that the England international, who turned 26 on Tuesday, had gone to the Chinawhite nightclub for a pre-arranged birthday party hours after the Old Trafford loss.
“Yes, I am aware of it,” manager Ten Hag said of Rashford’s post-derby night out.
“I spoke with him about it. It’s unacceptable, I told him, he apologised and that’s it. For the rest it’s an internal matter.
“He’s very motivated to put things right. So, he makes a mistake, but that doesn’t say he’s not fitting in. I see him every day in training, what he’s doing, I know.”
“(Alejandro) Garnacho can do the job very well, we have seen that often so I am confident.”