Manchester United could have suffered a huge injury blow to their top four credentials.
The Red Devils beat Luton Town 2-1 in the Premier League on Sunday night.
However, defender Luke Shaw had to go off at half-time, having also been subbed in his previous appearance.
Manager Erik ten Hag stated the issue was not a knock," which could suggest a longer absence.
Shaw was replaced by Victor Lindelof for the second half of the contest against Luton.
United held on to win the game, but will hope to have Shaw back when they play next weekend against Fulham.
