IRVING, Texas -- Rookie linebacker Sean Lee strained his hamstring early in the season opener and will probably miss Sunday's game against the Bears.
Lee didn't tell anybody about the injury until after the game and probably made it worse by continuing to play, coach Wade Phillips said.
Phillips wasn't pleased that Lee kept quiet about the injury after straining the hamstring on the first punt of the game. Phillips indicated that the second-round pick's poor performance played a significant role in the Cowboys' struggles covering kickoffs.
"Part of it was Sean Lee was trying to play hurt," Phillips said. "I think that hurt us."
Lee played only one defensive snap, but that wasn't due to his injury, since the coaches didn't know about it until after the game.
Lee's durability was a concern for many teams entering the draft. He missed the 2008 season at Penn State due to a torn ACL in his right knee.
This is the second time a strained muscle in his leg has sidelined Lee during his brief time with the Cowboys. He missed 13 practices during training camp due to a strained quadriceps, a significant roadblock in his development.