The Pirates have signed infielder Garrett Atkins and claimed minor league left-hander Aaron Thompson off waivers.
To make room for Thompson, Pittsburgh designated left-hander Wil Ledezma for assignment.
Thompson was left unprotected by the Nationals, who acquired him from Florida for first baseman Nick Johnson in 2009.
Atkins received a minor league contract and an invitation to their major league spring training camp.
Pirates Sign Atkins, Claim Thompson