Gallo is out of the lineup for Wednesday's game against Atlanta.
Though he'll take a seat against southpaw Max Fried in the series finale, the lefty-hitting Gallo looks to have recaptured a strong-side platoon role. Gallo has started in each of the Nationals' six matchups with right-handed pitchers in September, though he's mustered just one hit and three walks in 16 at-bats on the month.