Some are speculating it's something with his back, but Reds manager Dusty Baker didn't get into specifics. Baker said Rolen is "sore," and the third baseman didn't start Thursday night's game against the Cubs, a day after sitting out the finale of a three-game series in Milwaukee on Wednesday.
Todd Frazier was inserted at third base, and Miguel Cairo was in Thursday's starting lineup at first base.
Catcher Devin Mesoraco officially came off the seven-day concussion disabled list on Thursday, but now the Reds will be short another player for at least one more day if not longer.
"He's a little sore," Baker said of Rolen, who went 2-for-5 with a run scored and a double in the first two games against the Brewers on this road trip. "[He's] day to day. This came up ... [Wednesday] night. You get one guy back and another guy goes down temporarily. We just have to do like we've been doing the whole time [dealing with injuries]."