The Raiders' top receiving threat, Darrius Heyward-Bey, left practice early today woth a sore knee. That puts the top three Oakland wideouts in question for Sunday's game at Buffalo. Heyward-Bey told reporters he would expected to be fine for the game. No. 2 wideout Jacoby Ford (hamstring) did not practice and seems likely to be out. No. 3 wideout Louis Murphy (groin) is out.