PITTSBURGH — Steelers safety Troy Polamalu didn't practice all week because of a left knee injury and won't play Sunday in Kansas City. He might miss the Nov. 29 game at Baltimore as well.

Polamalu sat out the Steelers' second through fifth games with a ligament tear, only to injure the same knee during an 18-12 loss to Cincinnati last Sunday.

Polamalu's latest injury is to a different ligament. He wore a heavy brace as he watched practice this week.

Defensive end Travis Kirschke will sit out his third consecutive game with a torn left calf muscle.

Nick Eason will start again at left defensive end. Tyrone Carter will start at safety.