The Nationals recalled Millas from Triple-A Rochester on Saturday.
Millas will take the spot on the Nationals' 26-man roster that was vacated by Alex Call, who was placed on the 10-day injured list due to a partial tear of the plantar fascia in his left foot. It's the fourth time Millas has been called up to the majors this season, and across his 11 outings with Washington, he's gone 5-for-30 with two runs scored, two stolen bases and a solo home run. In Triple-A this season, he's slashing .311/.361/.518 with 10 stolen bases, nine home runs and 35 RBI across 241 plate appearances.