Pineda was examined by Yankees team physician Christopher Ahmad, but manager Joe Girardi said that Pineda's agent has requested that Mets team physician David Altchek also provide an opinion.
"When they found out he was going to New York, his agent requested that whatever happens, [they] want a second opinion," Girardi said. "Whatever that means, we should know more as time goes on."
Pineda has been on the disabled list, retroactive to March 31, with what the team termed right rotator cuff tendinitis. He cut short an extended spring outing on Saturday after just 15 pitches due to discomfort in his pitching shoulder.
Girardi said that the latest setback figures to knock Pineda out of action for at least another 3 1/2 weeks, regardless of what Altchek's diagnosis shows. There is a very real possibility that Pineda could be out longer, which Girardi called "disappointing."
"It's not what you want," Girardi said. "We thought we were going to get a power pitcher that pitched very well and we believed had a very huge upside. Right now, we don't have him, and right now, I can't tell you when we're going to get him back."