Manchester United boss Sir Alex Ferguson has thrown down a challenge to his young players.

Ferguson believes the likes of Ravel Morrison, Tom Cleverley and Paul Pogba could emerge to succeed the retired Paul Scholes.

"How do you replace somebody like Paul Scholes? It's very difficult. If you bracket four of the best midfield players in the world he'd be alongside Xavi and Iniesta and then you take your pick. In my mind he's one of the top four players in the world," said Ferguson.

"How will we overcome it? Maybe the next few weeks will help us overcome it. Maybe somebody will emerge out of the youth team or one of the young players emerge, and then we carry on."

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