Mets closer Jeurys Familia could miss the rest of the season after undergoing surgery to repair a blood clot in his pitching arm.

Mets general manager Sandy Alderson told reporters that Familia had the surgery earlier Friday in St. Louis and will miss "several months." Alderson said he did not know details about the surgery, acknowledging uncertainty about how long Familia, a hard-throwing right-hander, will be sidelined.