Posted: Wed December 26, 2012 2:15PM; Updated: Wed December 26, 2012 2:17PM

Manchester United's Wayne Rooney injured

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Wayne Rooney had been having an uneven season when he injured his knee.
Wayne Rooney had been having an uneven season when he injured his knee.
Matthew Peters/Man Utd via/Getty Images

MANCHESTER, England (AP) -- Manchester United striker Wayne Rooney will miss up to three weeks with a knee injury.

Manager Alex Ferguson says he strained a ligament behind the knee when he tried to hit a volley late in practice Tuesday.

The England star missed United's 4-3 win over Newcastle on Wednesday. Ferguson didn't specify which knee was injured.

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