Zimmerman said he could play, but Johnson wasn't going to take a chance on Zimmerman reinjuring his abdominal area.
Zimmerman entered the game as a pinch-hitter with two outs in the seventh inning and worked a walk, then was lifted for pinch-runner Brian Bixler.
Earlier in the season, Zimmerman recovered from a torn abdominal muscle and missed more than two months of action. He underwent surgery in the area on May 3.
"Anything like that, I'm not taking a chance on him reinjuring that thing, so he is [in the dugout] with me," Johnson said. "I'm going to see how it goes. He is willing to hit. I think fielding, probably throwing, is a little more aggravating than hitting."
Zimmerman has played in 28 games and is 24-for-107 (.224), with three home runs and 13 RBIs for Washington.