Steelers safety Troy Polamalu didn't practice for the second straight day while he heals from a left knee injury.

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Polamalu is not believed to have had a setback in his rehabilitation, and he's expected to play Sunday against Minnesota as long as he practices Friday.
Normally, the Steelers require a player to practice only once in advance of a game.
Polamalu returned from a four-game layoff with a torn medical collateral ligament to make an interception Sunday against Cleveland. He jammed his knee into the turf once during that game, but coach Mike Tomlin indicated later he wasn't reinjured on the play.

Oddsmakers from online sports book SPORTSBETTING.com have made the Steelers 4-point favorites over the Vikings in Week 7.

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Posted: 10/22/09 7:40PM ET

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