NEW YORK -- Two days after the announcement that his prize offseason acquisition would not play this year, Yankees general manager Brian Cashman admitted to fearing he made a mistake in trading away Jesus Montero for Michael Pineda.

"Right now, our hopes and dreams for this player are in jeopardy," Cashman said of Pineda. "Hopefully, someday, our fans will get to see what we expected to see from him for many years to come."

The Yankees announced on Wednesday that Pineda, acquired from the Seattle Mariners in January -- on Friday the 13th -- had suffered a torn labrum in a rehabilitation start on Saturday in Tampa and would undergo season-ending shoulder surgery.

"This is a massive decision gone wrong right now," Cashman told ESPNNewYork.com on Friday. "So all scrutiny is fair."

Cashman has asserted the Yankees had subjected Pineda to an MRI before the trade became official,

but doubts linger whether the Mariners and their GM, Jack Zduriencik, knew the 23-year-old right-hander was damaged goods when the Yankees made the deal.

"How can you not ask a question like that?" Cashman said. "It's a fair question, but I can tell you we did everything possible to be sure Michael Pineda was healthy."

Cashman said Pineda passed his Yankees physical within 72 hours of the deal having been agreed upon, a physical that included an MRI.

About a month later, the Yankees voided a deal with left-handed relief pitcher Hideki Okajima, a pitcher the club had much less invested in than Pineda, after he failed his physical.

"All I can do is lay out the facts; I can't control what people believe," Cashman said. "There are no secrets in Yankeeland, nor should there be. If something's there, it will eventually get out. I'm not going to compound the situation by lying about it."

As he had on Wednesday, Cashman absolved the Mariners and Zduriencik of any blame in the matter.

"The focus should be on me and the New York Yankees, not the Seattle Mariners," he said. "I'm responsible. I'm the decision-maker."

Cashman said he, too, had wondered about the condition of Pineda's shoulder during spring training, when he struggled to get his fastball above 90 mph on a consistent basis.

"I asked him several times through an interpreter if he had ever been in an MRI tube at Seattle," Cashman said. "Each time, the answer was the same.