The Steelers practiced again on Thursday in preparation for the Baltimore Ravens. RB Carey Davis (calf), DE Brett Keisel (knee) and T Marvel Smith (back) all sat out on Thursday. It is looking less likely that both Keisel and Davis will be available this week. Also not practicing on Thursday was LB James Harrison (knee) who was added to the injury report. S Troy Polamalu (calf) was limited on Thursday and should be good to go this week. RB Willie Parker (not injury related), CB Deshea Townsend (not injury related), WR Hines Ward (not injury related) and DE Aaron Smith (not injury related) all returned to practice fully on Thursday.