Perez cleared waivers and was assigned outright to Triple-A Rochester on Saturday.
Perez was removed from the 40-man roster after Friday's outing against the Brewers, when he allowed two hits across two scoreless innings. He has a shaky 6.19 ERA and 1.69 WHIP across 16 innings this season and will look to get his command and control in order in Triple-A. Orlando Ribalta was recalled by the Nationals from Rochester in a corresponding move.