Oklahoma defensive back Tre Norwood suffered a knee injury in the No. 4 Sooners' practice on Monday and it's unclear whether he'll be able to return to the field this coming season, sources told ESPN.
SoonerScoop.com reported that Norwood didn't practice Tuesday night and left the team's facility on crutches with a compression wrap on his left knee.
Norwood, a junior from Fort Smith, Arkansas, is one of Oklahoma's most experienced defensive backs. He started each of the last 19 games, including 17 at cornerback and the past two at safety. He was working at cornerback, safety and nickleback in spring practice.