Rio Ferdinand believes United's number ten, Wayne Rooney, has the ability to become the best number nine in the world - but only if he becomes more selfish.
Rooney made an instant impact in Thursday's Club World Cup semi-final win over Gamba Osaka, coming off the bench to score United's third goal with just his second touch of the ball. He found the net again minutes later as the Reds cantered to victory.
Replacing Carlos Tevez, Wayne took up a central position upfront and that's exactly the area where Rio feels his England team-mate really comes alive.
"The manager has asked him to be that player that runs through a lot more. He can do that," Ferdinand told PA Sport.
"With more time and the way he keeps working he can become more and more of a threat in behind. He has the strength and the nose where to run.
"Sometimes he needs to be more selfish. To score 25 or 30 goals a season you have to have a certain amount of selfishness. He probably needs a little bit more.
"He is capable of getting that number. I have played against him in training. I know how difficult he can be to play against and if he continues to keep working in the right areas he has the capability to be top scorer in the Premier League.