Source: Pittsburgh Steelers' Troy Polamalu likely out for month

Pittsburgh Steelers safety Troy Polamalu is expected to be sidelined about a month with a strained ligament in his knee, a source close to the situation told ESPN's Adam Schefter.

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Polamalu, who did not play in the Steelers' 27-24 overtime loss in Kansas City, injured a knee ligament while tackling Cincinnati's Cedric Benson last Sunday. He missed four games after hurting a different ligament during Pittsburgh's opener.

Polamalu's recent injury will not require surgery.

He wore a heavy brace as he watched practice this week.

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