PITTSBURGH — Pittsburgh safety Troy Polamalu is free of concussion symptoms and “all things are positive” for the AFC North showdown with the Cincinnati Bengals, coach Mike Tomlin said during a press conference Tuesday.

Polamalu left Sunday’s 13-9 win at Kansas City when his helmet struck the knee of Steve Maneri while Polamalu dove to tackle the tackle-eligible. That marked the second time this season the reigning AP defensive player of the year was forced out of a game due to a blow to the head.

But Tomlin said Polamalu was “asymptomatic ... relatively quickly — and I’m talking about Sunday night.”

The Steelers (8-3) and Bengals (7-4), fighting for playoff positioning and chasing the first-place Baltimore Ravens (8-3), meet in Pittsburgh on Sunday.

“Troy hadn’t had any concussion symptoms since we’ve been back here,” Tomlin said. “All things are positive in terms of his potential participation this week. Obviously, we’ll continue to err on the side of caution. He’ll have to pass a battery of tests and so forth in order to participate.

“We’re comfortable at this juncture that that will happen.”