Manchester United have a defensive headache to deal with at the worst possible time. The one positive lately from Manchester United’s dismal season was that the defensive injuries were beginning to clear up. Now we are back at square one, with both Harry Maguire and Luke Shaw suffering muscle injuries in last night’s match with Bayern Munich. There are no official injury timelines for either player yet, but Manchester United have to at least plan for both players to be out for this weekend’s match with Liverpool. Worst injury timingWhen you go to a stadium where you conceded seven goals last t…