Marcus Rashford missed training on Friday morning due to an illness, days after enjoying a midweek night out at the Thompsons Garage club in Belfast.
Footage on social media showed Rashford entering the Belfast night club on Wednesday night with sources close to the Manchester United star saying he was out for dinner.
Mail Sport understand that he was back in Manchester on Friday morning, but missed training that day after being taken ill.
Erik ten Hag revealed that the England international's absence was down to illness during his press conference ahead of their FA Cup fourth-round clash against Newport County on Sunday.