The New York Yankees announced on Thursday the placement of right-hander Joba Chamberlain on the 15-day disabled list with a right oblique strain, retroactive to April 28. General manager Brian Cashman said on a conference call that it's a "mild oblique strain" that Chamberlain suffered while warming up in the bullpen Tuesday night. Chamberlain showed up the next day reporting mild pain on his right side and had a scan Thursday prior to being disabled.

In 10 appearances, Chamberlain pitched to a 3.86 ERA with seven strikeouts over 9 1/3 innings. He last pitched on Saturday when he picked up a save with a scoreless ninth inning against the Toronto Blue Jays. He joins Derek Jeter, Alex Rodriguez, Mark Teixeira, Curtis Granderson, Kevin Youkilis, Francisco Cervelli, Ivan Nova and Michael Pineda on a crowded DL.

No announcement has been made on who will replace Chamberlain on the roster. The Yankees are weighing their options until Friday when they return to action against the Oakland Athletics at Yankee Stadium.

In other injury news, David Robertson had an MRI on his sore left hamstring, but he's day to day and according to Cashman "not a DL situation." A-Rod (hip) announced on his Facebook page that he was cleared for baseball activities. Cashman confirmed Rodriguez will begin on Monday in Tampa, Fla., and like Jeter is expected back "sometime after the All-Star break." Teixeira (wrist) will also go to Tampa at the end of the Yankees' homestand to join Rodriguez and Granderson (broken forearm), the latter who took two at-bats on Wednesday in an extended Spring Training game.

Infielder Corban Joseph was optioned back to Triple-A to make room for infielder Chris Nelson, acquired in a deal with the Colorado Rockies after Wednesday's game.

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