Injury update

Vikings LB Ben Leber and QB Tarvaris Jackson were the only players who missed a portion of practice Wednesday.
Leber (sprained left knee) said he is optimistic that he will play Sunday in Buffalo. He is listed as questionable. Jackson, meanwhile, had a scope on his right knee Monday, and he is listed as doubtful. He is off crutches.
Defensive tackle Pat Williams continues to treat an ankle sprain. But he practiced in full today.
Defensive tackle Kevin Williams was excused from today's practice for personal reasons.