Gallo will start in right field and bat seventh in Sunday's game against Atlanta, Andrew Golden of The Washington Post reports.
Since returning from the injured list Tuesday, Gallo has started in four of the Nationals' ensuing six games. He'll be making his second start in a row in right field, where he'll be filling in for Alex Call (foot), who was placed on the injured list Saturday. Though Call's injury could put him at risk of missing extended time, Gallo won't necessarily have a clear path to a full-time role for the rest of the season. The Nationals are set to call up prospect Dylan Crews from Triple-A Rochester on Monday, and he could move between right field and center field while poaching starts from Gallo and Jacob Young.