Kranick is slated to start Wednesday's game against the Diamondbacks, Jake Crouse of MLB.com reports.
After being called up from Triple-A Indianapolis on Tuesday, Kranick wasn't needed out of the bullpen in that night's 11-6 loss, so he'll get the ball for the series finale. Kranick, who owns a 3.38 ERA and 0.88 WHIP across two short starts for Pittsburgh this season, will step into the rotation as a replacement for Chase De Jong (knee), who was placed on the injured list Tuesday.