OAKLAND -- Just three months ago, right-handed pitcher Joey Devine spoke enthusiastically of being ahead of rehab schedule following last year's Tommy John surgery.

The A's wish they could still speak of the reliever's speedy recovery, but manager Bob Geren revealed Thursday morning that Devine has experienced a setback for the second time in the last two months.

Devine was dealt with a dose of tendinitis at the beginning of March and has yet to face live hitters on his journey back to a Major League mound -- which he hasn't seen since 2008 after posting a 0.59 ERA in 42 relief appearances.

Geren said doctors are currently evaluating an MRI that was ordered on Devine's elbow, and the club will hopefully know more in the next couple of days.

"He was getting ready to face hitters," the A's manager said, "when he realized something wasn't right. It seems like something comes up every time he's about right up to 100 percent."

Devine is currently taking part in extended Spring Training in Arizona and hoped to rejoin the A's by the end of April. However, the right-hander will seemingly not be ready for at least another month.

Blevins out with back spasms

OAKLAND -- A's Left-hander Jerry Blevins was deemed day-to-day Thursday after exiting Wednesday night's game with back spasms.

The 26-year-old reliever, who left an 0-2 count to New York's Curtis Granderson in the hands of teammate Tyson Ross in the eighth inning Wednesday, felt slightly better Thursday morning but was still stiff and planned on receiving treatment.

"It still feels tight," the southpaw said. "But hopefully it won't keep me out too long."

Blevins entered Thursday tied for third in the American League with eight games pitched and two wins.