The Nationals' right fielder is day to day, but he downplayed the injury after Tuesday's game and manager Davey Johnson is equally unconcerned.
"He would play if we were in a pennant race or something, but there's no sense," Johnson said. "He's played through this before, but I don't see the sense in doing that now and taking a chance on it."
Johnson said Werth could be available to pinch-hit, but he has to be careful of when with a short bench. Jonny Gomes and Laynce Nix got the starting nods in left and right field, respectively.
Werth hit two times after suffering the injury in the field in Tuesday's fifth inning, but he told Johnson he would have difficulty running and scoring from second on a single.
"Hopefully, I have the winning run on base if I have to use him," Johnson said.