Putnam, 29, had been on the disabled list since late April with a right elbow injury. He was cleared to begin throwing last month but was shut down after experiencing more elbow discomfort earlier this month. Putnam had surgery on his right elbow last August to remove a bone fragment as well, so it was an issue that had been nagging him for more than a year.
Putnam appeared in only seven games this season, giving up one run on two hits and a walk with nine strikeouts in 8 2/3 innings. The White Sox won’t be able to count on him until the middle of next season at the earliest.