"If there's a need here, and they want me here, I can foresee that," Hefner said.
Hefner underwent Tommy John surgery on Aug. 28, 2013, six weeks before Matt Harvey.
He is scheduled to throw off a mound Sunday for the fourth time since having surgery, but it will be the first time he's throwing off-speed pitches.
"That will be a test of how the ligament feels, and how it responds on Monday and Tuesday," Hefner said (Star-Ledger, June 22). "It's a big step. Every day is a big step."