IRVING, Texas — Dallas defensive end Anthony Spencer will have season-ending surgery on his left knee and may have played his last game for the Cowboys.
Spencer's agent, Jordan Woy, says doctors have a "good idea" what type of surgery but were still considering options. Cowboys owner Jerry Jones spoke earlier on his radio show, saying Spencer was likely to have microfracture surgery.
The 29-year-old Spencer is on a one-year contract with the franchise tag for the second straight season, so he will be a free agent when he's healthy again. He's making $10.6 million this season.
Spencer originally injured the knee in offseason workouts and aggravated it during a conditioning test the day before training camp. He had arthroscopic surgery July 25 and missed the preseason and the opener against the Giants.
The Oakland Raiders will begin a short week of preparation with uncertainty about who will start at quarterback.
Terrelle Pryor suffered a concussion in Monday night's 37-21 loss at Denver in the fourth quarter after a hard hit to the helmet by Wesley Woodyard.
Pryor will not be able to practice until he goes through the league-mandated concussion protocol. That means the Raiders (1-2) will have to prepare for Washington (0-3) with the possibility that either Pryor or Matt Flynn could start.