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8/19/2014 5:02 P.M. ET

Shoulder injury knocks McLouth out for season

WASHINGTON -- Nationals outfielder Nate McLouth is out for the rest of the season because of a torn labrum in his right shoulder, the team announced Tuesday. He will have surgery to repair the labrum Thursday.

McLouth has had problems with his shoulder all year, but manager Matt Williams believes that McLouth's shoulder got worse when he dove for a ball in right field during a 7-6 loss to the Marlins on July 28. However, the 32-year-old didn't go on the disabled list until Aug. 4.

"It had been something he has been dealing with all year. The symptoms got bad after that game in Miami," Williams said. "He dove for that ball, and it hasn't gotten any better since."

McLouth signed a two-year, $10 million deal with the Nats on Dec. 12 to help strengthen the bench. But he was having one of the worst seasons of his career, hitting .173 with one home run and seven RBIs.

With McLouth on the disabled list, Washington had only one left-handed bat -- Danny Espinosa -- on the bench. So on Monday, the team signed outfielder Nate Schierholtz to a Minor League deal. Schierholtz will play his first game for Triple-A Syracuse on Tuesday, but he is not expected to be in the Minor Leagues long.

As a pinch-hitter during his career, Schierholtz is 48-for-166 (.289) with four home runs and 23 RBIs.

Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.