San Francisco Giants left-hander Jose Alvarez suffered a setback in his rehab and will likely require Tommy John surgery, the San Francisco Chronicle reported Thursday.
Alvarez, 33, hasn't pitched since mid-June. He had two stints on the injured list, including one for elbow inflammation that turned out to be a strain of his ulnar collateral ligament (UCL), per the report.
Alvarez is expected to seek more opinions befor
