Blach was recalled from Triple-A Albuquerque on Tuesday.
Blach currently holds a 6.30 ERA and 1.45 WHIP over 40 innings in 20 big-league appearances this season. His unimpressive numbers suggest that he'll be used as a low-leverage option out of Colorado's bullpen and could be sent back to the minors once Carlos Estevez returns from the COVID-19 injured list.