Avila cleared waivers and was outrighted to Triple-A El Paso on Monday.
Avila was sent down after serving as the 27th man during a doubleheader in early May, and he'll now lose his spot on the 40-man roster while remaining in the organization. Over seven appearances (five starts) in El Paso, he's posted an 8.10 ERA and 1.77 WHIP in 23.1 innings.