The signs after the session were all positive. Depending on how he responds, the left-hander is expected to throw a simulated game next, then have a rehab start or two in the minors.
The three-time Cy Young winner, in the midst of another stellar season before the injury, has said he feels healthy. He was 15-2 with a major-league-best 2.04 ERA before the injury.
Barring any setbacks, he is expected to be back around Aug. 24.