Jay Gruden tells his players to avoid a Sean Lee situation

Sean Lee: Just brutal. The linebacker's knee injury is a crushing personal setback and a fairly devastating blow to a Dallas defense that was already suspect. 2. Michael Vick & Geno Smith: Geno has the advantage in this "open competition," but both 

IRVING (CBSDFW.COM) – A visibly and audibly frustrated Sean Lee was escorted off the Valley Ranch practice field during Tuesday's opening of Dallas Cowboys OTAs, a continuation of the injuries that have plagued the potential star middle linebacker.

Dallas Cowboys linebacker Sean Lee may be lost for the entire season following an injury sustained during OTAs.

Cowboys linebacker Sean Lee is helped off the field. (Vernon Bryant/The Dallas Morning News). IRVING – Video of Sean Lee's left knee injury has been posted on NFL.com. The footage shows Lee trying to cut back, however, 

Dallas Cowboys linebacker Sean Lee may be lost for the entire season following an injury sustained during OTAs.