Brett Keisel expected to return

PITTSBURGH -- Pittsburgh Steelers defensive end Brett Keisel is expected to play at Buffalo after missing all but a few plays of the last five games with a sore hamstring.

Rookie wide receiver Antonio Brown (swollen knee) will be limited in practice and might not play Sunday. Tight end Matt Spaeth's status is uncertain because of a concussion he sustained Sunday against Oakland.

Safety Will Allen has been cleared to practice after sitting out two games with a concussion. Safety Troy Polamalu might be limited again in practice due to an Achilles' injury, as he was last week, but coach Mike Tomlin said Tuesday he is expected to play.

Ramon Foster remains at right guard after being promoted ahead of Trai Essex and Doug Legursky before the 35-3 victory over Oakland.