Dr Gregory said there was a basic three-step procedure for dealing with the effects of an ankle bone spur, technically called a "posterior impingement".
He missed a start March 21 because of a shoulder impingement and missed another turn in the rotation this week after experiencing neck pain during a bullpen session Monday.
New York's remaining rotation includes left-hander Jonathon Niese and righties Matt Harvey, Dillon Gee, Jeremy Hefner and Shaun Marcum, who has been sidelined since March 16 because of a shoulder impingement and neck discomfort.
"We've maintained for many months that the proposal under consideration, a fundamental reordering of politics and a significant impingement on political speech, was too complicated and important to be jammed through the commission, " she said.