If you want a measure of how private a place the dressing room was when I was growing up at Manchester United, consider this: even Sir Alex Ferguson would knock before coming into the dressing room at the Cliff, the old training ground. The dressing room is for the players - and the players only.

From United's point of view, it is always difficult to tell just when a young footballer is going to mature into a first-class professional ready to play at the highest level, but the story of how Pogba slipped away from United has more than one strand to it.

My view is that you show Messi one side or the other, and if he goes past you, he goes past you. But if he slips it through your legs, then you have to obstruct him and take the foul. Just don't ever let yourself be nutmegged.

People say that Rooney could have been like Lionel Messi, a more prolific goalscorer who dribbles past opponents more. But they are different characters. You will never see Messi snapping around the heels of an opponent to win the ball back deep in his own half. Wayne does that all the time, and sometimes that enthusiasm will count against him.