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ESPN: Trent Richardson undergoes knee surgery

Alabama running back Trent Richardson won't participate in on-field drills during the NFL combine this week after undergoing minor knee surgery.

ESPN NFL Insider Adam Schefter reported Wednesday that Richardson's representatives sent all 32 NFL teams a memo about the procedure. The memo said that Richardson will be able to participate in on-field activities by the end of March, which means he won't take part in them during Alabama's pro day, which is set for March 7.

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