From Marc Carig of the Star-Ledger:

Yankees pitching prospect Michael Pineda has an anterior labral tear in his right shoulder that will end the 23-year-old right-hander’s season, Yankees general manager Brian Cashman said today.

In announcing the news to reporters this afternoon, Cashman said he was “devastated.”

Cashman said he believes the tear occurred on the final pitch of Pineda’s extended spring training start on Saturday. An MRI on Pineda’s shoulder administered this offseason, prior to the trade that brought Pineda to the Yankees, did not show any damage, Cashman said, though small labral tears are not visible on MRIs.

“We got a healthy player to the best of everybody’s knowledge,” said Cashman, who noted that Pineda’s rotator cuff is fine.