NEW YORK (CBSNewYork/AP) — The New York Yankees put Dustin Ackley on the disabled list on Tuesday, just five days after they got the infielder-outfielder in a trade with Seattle.

The Yankees made the move before beating Boston in the series opener.

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The AL East leaders also said ailing right-hander Michael Pineda isn’t expected back until September at the earliest, and that rookie outfielder Mason Williams needed season-ending shoulder surgery.

Ackley is sidelined with a strain in his right lower back and could miss a month, or more if surgery is needed. He was 0 for 3 in two games for the Yankees, and is batting .212 with six home runs and 19 RBIs for the Mariners and New York.

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The Yankees recalled right-hander Caleb Cotham from Triple-A Scranton/Wilkes-Barre.

Pineda went on the DL last week with a strain in his right forearm. He is 9-7 with a 3.97 ERA.

Williams injured his right shoulder in June diving into first base on a pickoff try.

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