Yankees closer Mariano Rivera, who injured his right knee in Kansas City back on May 3rd while shagging balls in batting practice, may have an opportunity to return to the mound this season, according to his rehab doctor, Dr. Keith Pyne.

Pyne told The New York Post that any decision with Rivera returning will go through his surgeon, Dr. David Altchek, and stated that “right now, he’s shut down until next season.” However, the words “right now” have opened the door for a possible return.

Pyne: “He’s well ahead of schedule in rehab, and is itching to get back.” He’s been rehabbing the knee four days a week and is “working his butt off.”

Rivera, who had five saves in nine games before the injury, has set a goal to return this season, and Pyne believes Rivera will be in the best best position to accomplish that goal.¬†On Monday, Yankees general manager Brian Cashman ruled Rivera “out” in terms of 2012, today, there’s a chance he’s on the mound in September.