The Cubs have activated reliever Carlos Marmol from the disabled list and sent Rafael Dolis to Triple-A Iowa.
Marmol, who went on the disabled list with a right hamstring strain on May 12, finished a rehab assignment at Iowa on Sunday with one scoreless inning.
"I feel great and I'm ready to pitch," he said. "I was able to find my arm slot again where I can get my slider back to breaking the right way."
Cubs Activate Carlos Marmol