Cowboys defensive end Anthony Spencer will require surgery on his left knee later this week, a source said.
An MRI confirmed a bone bruise after Spencer aggravated the knee during the team's conditioning test Saturday. Spencer has been pained by the knee since the team's OTAs in May and sat out the minicamp last month in hopes rest would heal it. But after this latest setback, doctors have advised minor surgery.
He is expected to be back in a few weeks, well in time for the season-opening game against the Giants.
But Spencer will miss even more valuable practice time as the Cowboys shift from a 3-4 defense to a 4-3 defense. Spencer and DeMarcus Ware are moving from outside linebacker to defensive end.
-- Charean Williams