The Cardinals optioned Crooks to Triple-A Memphis on Monday.
Crooks has been unable to find a groove at the plate since he was called up in late May, slashing just .179/.255/.336 with five home runs and a 32.2 percent strikeout rate. With Crooks returning to Memphis, the Cardinals are poised to promote Leo Bernal on Tuesday to work into the catcher mix with Ivan Herrera and Pedro Pages.