Only one player sat out of practice today for the Steelers and that was Linebacker James Harrison. Harrison was listed on the Steelers injury report with a back injury.
It's doubtful that this means anything in regards to his availability for Sunday in Indianapolis, though. Wednesday usually are rest days for many during a normal week where the team isn't coming off of a bye week. If he continues to sit out tomorrow then it might be time for concern.
Mike Mitchell was the only other player listed on the report. He was limited because of an injured achilles that caused him to miss most of the game in Detriot.