The 23-year-old Ecuador international has signed a four-year contract after moving for an undisclosed fee.

Valencia, who joins from Wigan Athletic where he scored three goals last season, is expected to help fill the void left by Cristiano Ronaldo following the star winger's £80m move to Real Madrid.

Valencia, who has played 34 times for his country, scoring four goals, told the club's official website: "Joining Manchester United is a dream come true for me. I have enjoyed my time at Wigan, but I am thrilled to have the chance to challenge for the biggest honours in club football here.

"Playing in front of 76,000 fans alongside players like Wayne Rooney, Rio Ferdinand and Ryan Giggs will be an amazing experience. I can't wait to get started."

Manager Sir Alex Ferguson added: "Antonio is a player we have admired for some time now, having spent the last two years in the Premier League with Wigan. I am sure his pace and ability will make a significant contribution to the team."

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