The A's worked out a deal late Thursday night to bring back Kurt Suzuki to provide much-needed depth at catcher.
Suzuki, 29, spent his first six seasons in the majors with the A's before a trade late last season to bolster Washington's injury ravaged catching ranks. The Nationals returned the favor barely 12 months later.
Oakland's primary catcher, John Jaso, has been out more than a month and possibly could miss the rest of the season after suffering a concussion. Jaso's early-season platoon partner, Derek Norris, has a fractured left big toe, and the lone remaining catcher on the roster, Stephen Vogt, was knocked on his back and hit his head during a collision with Seattle's Dustin Ackley on Wednesday.
The most experienced alternative at Triple-A Sacramento, Luke Montz, is on the disabled list.
The current starter at Sacramento, David Freitas, was acquired from Washington last August for Suzuki and has played just 22 games above Double-A.
Suzuki is hitting .223 with three home runs in 78 games with the Nationals but has worked with most of the A's pitching staff, a significant factor as the squad makes another run at the playoffs.
According to the Washington Times, the A's are believed to be sending a pitching prospect to the Nationals in return for Suzuki.