"He is running good, feeling good. It will be good to get him back," manager Davey Johnson said.
Besides being an excellent catcher, Ramos will provide power to Washington's lineup. He was hitting .250 with two home runs and six RBIs in 44 games before he was placed on the disabled list. Ramos is expected to split playing time with Kurt Suzuki behind the plate.
The Nationals also signed veteran Kelly Shoppach to a Minor League deal on Wednesday as an insurance policy.
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.