Brandon McCarthy Has Torn UCL

6:57pm: McCarthy says he likely will undergo Tommy John surgery, Shaikin tweets.

6:19pm: Dodgers starter Brandon McCarthy has suffered a torn ulnar collateral ligament, Bill Shaikin of the Los Angeles Times reports (Twitter links). Manager Don Mattingly declined to say whether the righty would undergo Tommy John surgery, but it would obviously end his season if he does.

The 31-year-old signed a four-year, $48MM deal to join the Dodgers after posting his first 200 inning tally last year. While the results were not quite there, he worked to a career-best strikeout rate of 7.9 per nine and seemed primed for a strong 2015 campaign. Though McCarthy came with a history of arm ailments, Los Angeles decided that the risk was worth taking.

McCarthy was off to a slow start this year, due mostly to struggles with the long ball. Over just 23 frames, he had already permitted a league-high nine dingers, though he has also retired an impressive 29 batters by way of strikeout.

Now, assuming he undergoes a TJ procedure, McCarthy will have to wait until some time in 2016 to prove that the long balls were just a short sample quirk. Recovery time is generally over a year, meaning that McCarthy will probably require at least an early-season fill-in next season — assuming that he makes steady progress.