The Pittsburgh Steelers won't have safety Troy Polamalu in the lineup Sunday due to a left knee injury that could sideline him next week as well against the Baltimore Ravens.

Polamalu didn't practice all week after injuring a ligament against the Cincinnati Bengals.

Tyrone Carter starts in his place.

Meanwhile, defensive end Travis Kirschke will miss his third game in a row due to a torn left calf muscle.

Kirschke was the replacement for Aaron Smith, who's out for the season with a shoulder injury.

So, Nick Eason will start again in Kirschke's place.

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