"I didn't feel it at all after the running drills. It's just getting the hitting together right now, the timing," Cain said.
Cain sustained the injury in batting practice on Aug. 9, and he was placed on the 15-day disabled list the next morning. He was batting .261 in 96 games before getting hurt.
Dick Kaegel is a reporter for MLB.com. Kathleen Gier is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.