Cowboys defensive end Anthony Spencer will have minor surgery on his left knee later this week, reports say.
An MRI confirmed a bone bruise after Spencer aggravated the knee during the team's conditioning test Saturday. He began Sunday's practice but was unable to finish. He is expected to be out for at least three weeks but should return in time for the season opener against the New York Giants.
Spencer has been in pain since the team's organized team activities in May and sat out the minicamp last month to rest the knee. After this latest setback, doctors have advised that he go through the procedure.
Spencer needed the practice time because the Cowboys are shifting from a 3-4 defense to a 4-3 defense. Spencer and DeMarcus Ware are moving from outside linebacker to defensive end.