Woodley out, Polamalu back for Steelers

Besides the headline that quarterback Ben Roethlisberger has been ruled out for Sunday's game at Baltimore, there was injury news for the NFL's top-ranked defense.

Here's the good: Troy Polamalu is expected back after missing the past seven games with a calf injury. The Pro Bowl safety is listed as probable.

Here's the bad: linebacker LaMarr Woodley is out with an ankle injury. He will be replaced by Jason Worilds.

The Steelers pass defense is ranked first in the NFL despite not having Polamalu. But the Steelers are hoping to generate more game-changing plays with him in the lineup. Polamalu is expected to play a "significant role," according to defensive coordinator Dick LeBeau. "I don't think he will be able to be out there every snap," LeBeau told reporters Thursday. "He is in good shape, but I think his football conditioning needs some development."

The Steelers have also ruled out right tackle Mike Adams (ankle) and backup quarterback Byron Leftwich (ribs). Left guard Willie Colon (knee) is questionable, and wide receiver Antonio Brown (ankle) is probable. Brown has been sidelined the past three weeks.