Oliver suffered a knee injury during Saturday's preseason opener against the Bears. Even though he's been cleared to play, he will not return to the game, according to the NFL Network broadcast.
We'll see if the early week practice reports reveal anything more, but it looks like the Bills may have dodged a bullet after Oliver was injured in the first quarter. The defensive tackle is arguably the team's most important player on that side of the ball, so perhaps the Bills are just playing it safe with a player who will not require much work ahead of Week 1.