Hard to lay too much blame at his feet tonight, he's a right back that's known to get out of trouble for his lack of awareness with his pace playing at centre back, he simply shouldn't be asked to do that tonight u less we've got literally no other options, which clearly wasn't the case. piss poor from Pep.
However, some of it he should be doing better, some basic stuff tonight, not anticipating obvious runs, not closing down djenepo for their second allowing him a free shot from 20 yards. And then his fucking passing! Why the hell does he feel the need to absolutely rifle a ball into a blue shirt 10 yards away who's marked making it as difficult as possible to control?
He has to play weekend to handle Rashford but he needs to stop thinking he's better than he is, stick to his strengths accept your limitations and keep things simple to find some form before he finds himself behind an 18 year old permanently.