"We'd given him a couple extra days because he was a little tender, and I guess he was throwing again, and it was a little different spot," manager Joe Girardi said. "So we're going to have an MRI."
de Paula, who signed a Major League deal with the Yankees this offseason, tossed two scoreless innings in his lone appearance this spring on March 7. He racked up a 4.21 ERA across 16 outings (10 starts) for San Francisco's Triple-A affiliate, Fresno, last season.
Paul Casella is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.