He doesnt have the agression and dominance of to be a top centre backHe’s actually pretty strong, is very quick, his tackling, especially standing, is also very good.
His biggest and most glaring flaw is his over confidence in his ability to dribble out of trouble, or trying to pick an eye of the needle pass. Its a recipy for disaster and results in some dreadful errors.
I’m confident Mourinho won’t bin him, but if he does I will be very disappointed. Doubt many will agree but I’ve no doubt he will be a much better center half than Sanchez in the future.