Rollins fouled a ball off his knee during the first at-bat of the game. He stayed in the game and doubled before scoring. But the 2007 National League MVP was noticeably limping throughout the following two innings and Wilson Valdez eventually replaced him in the lineup.
After the game, he was walking with a pronounced limp but did not seem overly concerned the injury was serious. No x-rays were taken, and Phillies manager Manuel said Rollins is day to day, though he is not expected to be in the lineup Sunday.
Saturday's game came a day after the Phillies finally had their entire everyday lineup healthy and available for the first time this season.
The Phillies lost their fourth straight Saturday, falling to Pittsburgh 6-3.
Information from The Associated Press contributed to this report.