Rollins left Wednesday's game early, and the first-place Phillies were off Thursday. He sat out Friday night's 8-4 win over the New York Mets.
Phillies manager Charlie Manuel indicated Rollins may not start Saturday, either. There is a chance the three-time All-Star could play Sunday.
Rollins has twice been on the 15-day disabled list this season because of a calf problem.
The Phillies also reinstated right-hander Danys Baez from the 15-day disabled list.
Information from The Associated Press contributed to this report.