Romelu Lukaku was taken off on a stretcher in the first half of Manchester United's clash with Southampton at Old Trafford.
The medical staff have been assessing the extent of the problem and hopefully it will not be too serious.
“That's football,”
Jose Mourinho told MUTV. “He was just unlucky. I think the Dutch central defender goes with him for the ball and it's unlucky for Romelu and unlucky for Hoedt. It was nothing aggressive and, hopefully, nothing important. But the first consequence of is he didn't play for the rest of the game.”
United's next outing is away to Lukaku's former club, Everton, on New Year's Day.