Blach is scheduled to start Saturday's game against the Brewers in Milwaukee.
The veteran southpaw will pick up a second straight turn through the rotation after he yielded five earned runs on five hits and two walks over four innings last Sunday versus the Orioles in his return from Triple-A Albuquerque. Blach is likely just a placeholder in the rotation until the Rockies get Antonio Senzatela (elbow) back from the 60-day injured list, perhaps as soon as next week.