Harrison is still trying to get back but a balky knee continues to hinder him and keeps his status uncertain going forward.
Polamalu was out for a second consecutive week with a strained calf he suffered against the Denver Broncos in the season opener. With a bye coming up for Pittsburgh, the former All-Pro should be back for the next game in two weeks.
Running back Rashard Mendenhall has been rehabbing a torn ACL that he sustained in the 2011 season finale against the Cleveland Browns. Mendenhall has been getting closer to seeing action and could be ready to go by Week 5.
Linebacker Stevenson Sylvester has an MCL sprain that has kept him out of all three games, but may be ready to return for the next tilt.