Williams, who missed his first game of the season Sunday due to a back injury, is sitting out Wednesday's practice, NFL.com reports.

EDGE Analysis

The Steelers tore up the Bills on the ground all day long in Week 14, after which coach Rex Ryan publicly pined for Williams' return to the lineup this week. It's not thought to be a serious back injury, but no injury to that area is ever easy, so we'll see if the veteran's able to rally for practice later in the week.