The St. Louis Cardinals have yet to announce who will replace John Gant (and Carlos Martinez, eventually) in the rotation. The easiest option would likely be to insert Wade LeBlanc into the rotation since he is somewhat stretched out and has a history of starting in the majors.
The other options are Jake Woodford, who has a 5.81 FIP in the bullpen, and a group of minor league starters. To begin with, if the Cardinals prefer an option that is already on the 40-man roster, Angel Rondon could be an option. The 23-year-old made his MLB debut earlier in the season, but his 5.