OAKLAND -- The A's continued to fill their need for left-handed relievers when they announced Wednesday that they have signed Eric O'Flaherty to a two-year, $7-million contract.

The O'Flaherty signing won't have an immediate impact on the bullpen, however, as he is coming back from Tommy John-style ligament replacement surgery in his left elbow and isn't expected to be ready until mid-season.

The A's lost one of their prime lefties when they dealt Jerry Blevins to the Washington Nationals in December, but they added Drew Pomeranz from the Colorado Rockies for Brett Anderson in another December trade. Sean Doolittle is the No. 1 lefty in Oakland's bullpen.

O'Flaherty, 28, has spent the last five seasons in the Atlanta Braves bullpen, where he posted a 13-7 record and 1.99 ERA, all of it in setup work. He came to Atlanta from Seattle, where he broke in as a 21-year-old in 2006.

A reasonably hard thrower at 91 mph with his four-seam fastball, O'Flaherty does most of his damage with a mid-80s slider and a deft changeup.

O'Flaherty appeared in 19 of the Braves' first 41 games in 2013 before his elbow went out in late May and he needed Tommy John surgery.