Erik ten Hag lost another of his first choice defenders when Luke Shaw was forced off at half-time against Aston Villa.
While the nature of Shaw's problem is yet to be disclosed, the left back has had numerous issues with injury in recent seasons and United fans quickly became concerned that their first choice left back is facing another spell on the sidelines.
Victor Lindelof, a centre back being tasked to cover at left back, came on to replace him, with United looking to hold on to a 1-0 lead after Rasmus Hojlund's first half strike.