The Rockies designated Blach for assignment Sunday.
Blach was called up from Triple-A Albuquerque on Sept. 1 after Cal Quantrill (tricep) was placed on the 15-day injured list. Blach took the loss in both of his starts since his call-up, allowing 11 runs (10 earned) on 11 hits and two walks while striking out two over 7.2 innings. Blach was serving as a placeholder in the Rockies' rotation, and with Antonio Senzatela (elbow) nearing his return from the 60-day IL, there doesn't appear to be any room on the 40-man roster for the former. Right-hander Victor Vodnik (biceps) was reinstated from the 15-day injured list in a corresponding move.