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"We (United) have not won the Champions League since 1999.
"And you only have to look at the FA Cup, that drives us as players and a club because we want to be the first club to lift the cup at the new Wembley.
"So it's things like that which keep the edge to your game. Yes as a player you need new challenges, and OK I'm very proud of what I and the club have done.
"But we have not won the Premiership for the last three years and that in particular is a massive motivation."