I remember something Rafa said at the start of the seaon when we were a little suspect defensively. He said that as we had more width we had lost the stability through the centre, so I wonder if he will go for right and left sided players who can tuck in and condense the play when we don't have the ball. If so it would require a particular style of winger, not one who hugs the touchline, but maybe one who is more a left or right sided midfielder with the ability to track back and defend.