The A’s say Griffin had the surgery Wednesday morning in Houston after receiving a second opinion on his sore arm Tuesday from Dr. Thomas Mehlhoff. The doctor also operated on Oakland pitcher Fernando Rodriguez last year. Teammate Jarrod Parker underwent the same surgery before the season.
The 26-year-old Griffin was 14-10 with a 3.83 ERA last season.
Griffin had begun the season on the disabled list with the hope of returning from his injury after rest, but never got far enough to resume a throwing program.