The Nationals purchased the contract of Mike Gonzalez, a veteran left-handed reliever signed to a minor league deal only a month ago, and optioned right-handed reliever Ryan Perry to Class AAA Syracuse Sunday.

Since his signing in early May, Gonzalez made one appearance for Syracuse on June 1, tossing a scoreless and hitless 1 1/3 innings and striking out two.

Gonzalez, 34, has 56 career saves. Last year he posted a 4.39 ERA in 53 1/3 innings for the Orioles and Rangers. General Manager Mike Rizzo had been in touch Gonzalez’s agent, Scott Boras, since spring training but when Brad Lidge went on the disabled list with a hernia in late April, the Nationals’ interest intensified. When Gonzalez was signed, Rizzo, who had scouted Gonzalez previously, said the move would provide depth.

Perry, 25, has pitched for the Nationals with mixed results. The Nationals acquired him in a trade last winter that sent Collin Balester to the Tigers. Perry was called up from Syracuse when Lidge was injured. In eight innings pitched, Perry has a team-high 10.13 ERA.

Gonzalez becomes the fourth left-handed reliever on the Nationals roster, along with Sean Burnett, Ross Detwiler and Tom Gorzelanny.