Still needs to sharpen up his anticipation when an attacking player comes at him with the ball. Darmian is much, much better at that. Newcastle seemed to be able to shift the ball to either side of him a few times and get the ball into the box, where as very few balls come in from our right hand side.
But in terms of recovering the ball at pace, winning it back and getting us moving forwards again, I think he's already one of the best in the league at that. Doesn't get done for pace, and always seems to manage to get a clean tackle in when it looks impossible.