PONTIAC, Mich. (AP) - Pittsburgh Steelers Pro Bowl safety Troy Polamalu said he "tweaked" an ankle during practice Thursday and was added to the team's Super Bowl injury report as probable.
The cause of the injury wasn't immediately known. Only a pool reporter selected by the NFL is permitted to watch pre-Super Bowl practices, and Polamalu mentioned the injury to that reporter.
The injury was first revealed when the Steelers listed him on their daily injury report.
Polamalu, who lines up in a variety of formations in the Steelers' 3-4 defense, has starred in all three Pittsburgh playoff victories. He had 19 tackles, an interception and a half-sack in road victories over Cincinnati, Indianapolis and Denver.
"He's not like any other safety I have ever seen," Steelers defensive coordinator Dick LeBeau said.
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