A.J. Burnett was shelled for 12 earned runs in 2 2/3 innings Wednesday in a loss to the Cardinals.
Andrew Cashner (shoulder) will be activated from the disabled list prior to Saturday's start against the Diamondbacks.
Zack Greinke (elbow) had his scheduled start on Thursday pushed back to Saturday.
Brandon Belt (concussion) was told following an exam in Pittsburgh that he's still at least 2-3 weeks away from being cleared for doing any physical activity.
Buster Posey is out of Wednesday's lineup against the Cubs after his left hip flared up.
Starlin Castro has been scratched from Wednesday's lineup against the Giants due to a family emergency.
Aroldis Chapman (shoulder) expects to be available out of the Reds' bullpen on Wednesday.
Masahiro Tanaka (elbow) threw a successful 35-pitch bullpen session on Wednesday afternoon.
Jose Bautista finished 2-for-5 with a homer and three RBI in Wednesday's 9-5 win over the Brewers.
Yadier Molina (thumb) took light swings on Wednesday.
Michael Cuddyer (hamstring) expects to return Friday.
Nationals manager Matt Williams said Wednesday that he expects Ryan Zimmerman (hamstring) to return from the disabled list "sometime in September."