Zimmerman, who is on the disabled list because of a left hamstring strain, is hoping to be activated by the time the team opens a series with the Pirates on Friday.
Once Zimmerman returns to action, the Nationals will likely send third baseman Anthony Rendon back to Double-A Harrisburg.
As for Ramos, he is currently on a rehab assignment at Harrisburg and should be activated by Monday when the Nationals play the Braves. He, too, is on the DL as a result of a left hamstring injury. Ramos will return to the team on Sunday.
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.