Clippard, 23, went 1-1 with a 4.35 ERA in two starts with Washington. On Saturday, he earned the victory against the Mariners at Safeco Field, allowing two earned runs in six innings. Clippard was informed after the game that he was going to be sent down to the Minor Leagues.
"It's been crazy," Clippard said after Saturday's game. "[I've been] kind of wondering what's going on, if I'm going to be here or not, but that kind of stuff is out of my hands. They tell me what I'm going to do and I do it. I can't do anything except for that."
Lo Duca, 36, has missed the last 36 games after going on the DL with a fractured right hand. He appeared in three rehab games with Columbus, going 1-for-11 with an RBI. Prior to joining the Clippers, he went 2-for-5 with a double and an RBI in a two-game stint with Class A Potomac.
Lo Duca is expected to back up Jesus Flores behind the plate, play left field and first base and serve as designated hitter during Interleague Play.
Lo Duca is batting .200 (10-for-50) with four RBIs in 17 games with the Nationals this season.
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.