Troy Polamalu’s latest knee injury doesn’t appear as significant as his last, but Steelers coach Mike Tomlin said Tuesday the Pro Bowl safety is “questionable at best” for Sunday’s game against the Chiefs.

Polamalu suffered a sprain to his posterior cruciate ligament to his left knee against the Bengals, the same knee in which he injured his medial collateral ligament that kept him out for four games earlier this season. Tomlin said Polamalu did not suffer at setback to his previous injury, and that they’ve received some favorable information after meeting with doctors.

“He’s in a great frame of mind,” Tomlin said. “He feels really good.”

For now, Polamalu will be considered day to day, according to Tomlin.