"He's got a hamstring injury," Tomlin said. "I don't know the extent of that. We got to take a look at it."
Keisel, 32, iced the hamstring after leaving the game and wore shorts on the sideline during the second half. He was the first player out of the Steelers' locker room after the game, according to The Post-Gazette.
"I'm OK," he told the newspaper.
The Associated Press contributed to this report.