Manchester United brought on defender Willy Kambwala against Chelsea, but it was not his preferred move. In the 66th minute at Stamford Bridge, Erik ten Hag turned to his bench and finally called on his number 53, Willy Kambwala. Kambwala is the sixth choice centre-back at Manchester United, perhaps seventh choice if Luke Shaw is fit. But given the circumstances, Kambwala should have been bumped up the pecking order considerably for the past few games, now Erik ten Hag is depending on him. Manchester United defensive injuriesManchester United have been reeling with defensive injuries, and two …