Blach will stick in the rotation after Johnny Cueto (forearm) returns from the disabled list Friday, MLB.com's Chris Haft reports.
Blach may have felt like he was pitching for his rotation spot in Wednesday's loss to the Padres, but he will avoid a demotion to the bullpen with the Giants deploying a six-man rotation going forward. The rookie didn't pitch particularly well, taking his fourth consecutive loss while allowing three runs on five hits with two walks and just one strikeout over 5.2 innings. The soft-tossing lefty has surrendered six home runs in his last four starts after posting a league-best 0.7 HR/9 over his previous 19 outings. Blach's next start will be pushed back to next Tuesday, but the scheduling change will not get him out of a dangerous matchup on the road in Colorado.