Pittsburgh Steelers linebacker James Harrison is questionable for Sunday night's opener against the Denver Broncos with a knee injury.

Harrison had taken limited reps on Wednesday, but was held out of practice on Thursday and Friday.

After not practicing Wednesday with an ankle injury, linebacker Larry Foote was a full participant in practice on Thursday and Friday. He is listed as probable.

Running back Baron Batch, who missed Thursday's practice with a groin injury but was a full participant Friday, is listed as questionable.

Safety Ryan Clark, who participated in practice for a third straight day, is guaranteed to miss the Sunday night contest in Colorado's capital due to a blood disorder which makes it impossible to play at high altitudes.