Harrison has a back injury and did not participate at the Steelers' practice Wednesday.

EDGE Analysis

It's unclear when Harrison sustained the injury as the Steelers are coming out of their bye week. The 39-year-old has battled multiple ailments and played in only three games this season, recording three solo tackles and a sack. The veteran linebacker is illustrating major wear-and-tear in his 15th NFL season and remains off the IDP radar.