Pelfrey posted a 2.29 ERA in three starts before partially tearing the ulnar collateral ligament in his right elbow and undergoing surgery. He is on schedule with his rehabilitation.
"We're very excited about his progress and where he's headed," manager Terry Collins said. "The reports are very positive. Hopefully, by next spring, he'll be ready."
Pelfrey, 28, played light catch on the field prior to the game before heading back to his home in Wichita, Kan.
Collins says it was good to see Pelfrey back in the locker room.
"He's one of my favorite guys," Collins said. "He's really upbeat. He feels great."
Collins thinks Mike Pelfrey could be a solid Major League closer, saying he has a perfect temperament for the job.
"He's a big, strong, durable guy," Collins said. "One inning at a time, he could be pretty impressive."