(Jonathan Ernst/GETTY IMAGES)

Nady’s injury had not been previously disclosed. Nady, whom the Nationals signed to a minor league contract in mid-March, is hitting .157/.211/.275 this season with three homers in 109 plate appearances over 40 games. He occasionally started against left-handed pitchers, and typically was one of Manager Davey Johnson’s first right-handed bats off the bench.

Nady, 33, has had rotten injury luck the past few seasons. He missed almost all of 2009 after he underwent Tommy John surgery for the second time. Last year, a broken left hand knocked him out for the final two months.

With Nady out, Tyler Moore could become the Nationals’ full-time left fielder against left-handed starting pitchers. He is playing there today, batting seventh.

Nady is the 15th player the Nationals have placed on the disabled list since the start of the season.

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