Manchester United captain Roy Keane has confessed that Cristiano Ronaldo can't win United the Premier League title.The Red Devils announced on Friday afternoon that they had reached an agreement with Juventus to bring Ronaldo back to Old Trafford.Ronaldo left United in 2009 for a then world-record fee of £89million when he became Real Madrid's latest Galactico.He has enjoyed a wealth of success at Real and the Old Lady, but Keane isn't convinced that his arrival will welcome a similar of success for United.He said on Sky Sports: "I think it's great news for United, the fans, the Premier League."There's no doubt in my mind he's still a world-class player...
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