Manchester United will be without in-form winger Antonio Valencia for up to a month after he injured his hamstring, Sir Alex Ferguson confirmed.

Valencia pulled up late on in Thursday night's 2-0 win over Ajax in the Europa League, having come on as a second half substitute and helped to set up Javier Hernández for United's second goal in the game.

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The Ecuadorian, who missed the majority of last season after breaking his left ankle, has been in outstanding form in 2012, with a goal and three assists in his last four English Premier League games.

"He has a hamstring injury unfortunately," United boss Ferguson said. "It will be four weeks. It is a bad blow for us."

The injury will see Valencia likely missing for the league trips to Norwich and Tottenham followed by United's home game with West Brom on March 10.

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