The Nationals optioned Garcia to Triple-A Rochester following Wednesday's 3-2 win over the Brewers, Andrew Golden of The Washington Post reports.
Garcia, who was on the bench Wednesday but entered the contest late as a pinch hitter, will head back to the minors after going 12-for-61 (.197 average) while drawing just two walks in 18 games since the All-Star break. The Nationals haven't announced an immediate replacement for Garcia, but among players currently on the 26-man active roster, Ildemaro Vargas or Michael Chavis could be first in line to fill in for him at the keystone.