Dallas Cowboys defensive end Anthony Spencer is having arthroscopic surgery on his left knee and could miss the rest of training camp.
Cowboys coach Jason Garrett said Tuesday the surgery would be performed this week. He said the Cowboys "don't think it's a very severe thing" and put the recovery time at two to four weeks.
Spencer hyperextended the knee in offseason workouts and said he aggravated the injury in the conditioning test before training camp. He has described the injury as a bone bruise.
The 29-year-old Spencer had a similar procedure in late August in 2008 but just missed one regular-season game. Dallas breaks camp Aug. 16.
He was the leading tackler last season and finished a half-sack behind DeMarcus Ware with a career-high 11.