The Reds open a three-game series against the Brewers on Monday night.
The 35-year-old Rolen is a six-time All-Star and a catalyst for the Reds' turnaround season. He's batting .287 with 17 homers and 57 RBIs, but carries a season-long 0-for-13 slump into Milwaukee.
Rolen hurt himself on July 16 against the Rockies when he felt a burning sensation in his right hamstring after being thrown out at third. He also had a cortisone shot, but managed to avoid a trip to the 15-day disabled list.