The St. Louis Cardinals will promote Luke Weaver to start on Saturday in place of Michael Wacha.

Wacha has been placed on the disabled list.

Weaver will make his debut against the Chicago Cubs at Wrigley Field. In 13 Minor League starts this season, the 22-year-old is 7-3 with a 1.30 ERA.

The Cardinals called up another prospect, Alex Reyes, on Tuesday and he pitched a perfect inning against the Cincinnati Reds out of the bullpen.