Heisman Trophy winner Charles Woodson, the Oakland Raiders' top draft pick, hurt his left knee during practice Tuesday. The extent of the injury was not immediately known.
Woodson, the fourth pick overall from Michigan, was injured during a pass play, and the cornerback was helped off the field before limping off on his own to the trainer's room. He did not return to the morning practice session.
Raiders coach Jon Gruden said Woodson "hyperextended his knee."
"We don't think it's serious," Gruden said. "We'll find out more later."
Woodson, the fourth pick in this year's draft, was not available for comment after the practice, and did not participate in the afternoon session.
The promising rookie started Sunday at left cornerback against the Green Bay Packers. He is expected to start the season opposite Eric Allen.
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