SEATTLE -- Francisco Cervelli's MRI came back negative Monday, but that was about the only good news for the backup catcher.

The Yankees placed Cervelli, diagnosed with his third concussion in less than three years, on the 15-day disabled list Tuesday, backdated to Friday. He's eligible to come off the DL Sept. 24, but having suffered multiple concussions and the general unpredictable nature of recovery time for them puts his prospects of being a player in the postseason very much in question.

"I can't tell you either way," general manager Brian Cashman said late Tuesday afternoon by phone. "Until his symptoms completely subside, he won't be doing anything. I can't tell you he will be or he won't be."

Cervelli was injured Thursday in a collision at the plate with Nick Markakis of the Orioles. He flew with the team to Anaheim that night but he experienced dizziness Friday and Saturday and was sent back to New York on Sunday. After meeting with a neurologist at New York-Presbyterian on Monday, Cervelli was diagnosed with a concussion, though MRI results were negative.

Tuesday, he met with the Yankees team physician Christopher Ahmad.

"Ultimately, he still has symptoms," Cashman said. "If he needs the rest of the season, we'll give him the rest of the season."

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Russell Martin's backups are Jesus Montero and Austin Romine, who got his first major-league start Monday and earned rave reviews from Joe Girardi and that night's starter, Phil Hughes.

"The defensive aspect of Romine," Cashman said, "is exceptional. No issues."