Left-hander John Gast left Saturday's start with shoulder tightness, and, on Sunday, the Cardinals placed him on the 15-day DL according to Jenifer Langosch of MLB.com. Righty Michael Blazek has been recalled from Triple-A Memphis.
Gast, 24, went 2-0 despite a 5.11 ERA and 1.30 WHIP in three starts with St. Louis. He replaced Jake Westbrook, who was placed on the DL with elbow inflammation earlier this month. The 24-year-old Blazek saved seven games with a 0.92 ERA at Double-A Springfield this year, and he figures to serve as an extra bullpen arm until Gast's rotation spot comes up again.
Langosch notes right-hander Michael Wacha is no longer listed as the starter for Sunday night's Memphis game, which could be an indication he will be called up to replace Gast. In nine starts at that level this year, the sinker-baller owns a 2.05 ERA and 0.95 WHIP to go along with a 38-percent ground-ball rate according to First Inning.
Wacha, 21, was the 19th overall pick in the 2012 draft. Baseball America ranked him as the team's sixth-best prospect before the season, saying it's "easy to project him as a mid-rotation starter, and he could turn into something more if he finds a reliable breaking ball" in their subscriber-only scouting report.
In addition to Westbrook and Gast, the Cardinals lost southpaw Jaime Garcia to season-ending shoulder surgery earlier this month. Right-hander Chris Carpenter started the year on the DL and is working his way back from neck, shoulder and arm issues.