Polamalu (MCL sprain) sidelined for 3-6 weeks.

The Steelers saw the dramatic difference in their defense when playing without their All-Pro safety, as Polamalu injured his left knee in the second quarter and did not return to the game or the sidelines at Heinz Field. Coach Mike Tomlin said Polamalu had an MCL sprain and expects his star safety to be sidelined for 3-6 weeks.

Steelers coach Mike Tomlin said he didn't know how serious the injury was immediately afterward.

"It is an MCL sprain," Tomlin said. "They are reading the scans and so forth. Those things have a range of three-to-six (weeks). It is speculation at this point."

Polamalu had a team-high six tackles (all solo) and an interception in the first half, as well as two personal-foul penalties -- even though he didn't play the final defensive series.

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