Belliard, who brings high energy to the club, is expected to see a lot of action at third and second base. He was on a rehab assignment. Belliard went 0-for-12 for Double-A Harrisburg and 0-for-3 for Class A Potomac on Monday.
Belliard had been on the disabled list since May 19 because of a left calf strain.
Clippard pitched for the Nationals on Monday and took the loss, allowing three runs in 4 1/3 innings against the Giants.
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.