NEW YORK -- Rafael Montero's rehab assignment on Sunday apparently did not go entirely as planned.

Although Montero completed three innings in a start for Class A St. Lucie, the right-hander was unable to go the scripted length and will be unable to help the New York Mets in either a starting or relief capacity anytime soon.

Montero has been dealing with what has been labeled rotator-cuff inflammation since he landed on the disabled list in late April.