Alex Reyes Scheduled To Make Next Start For Triple-A Memphis & Could Join Cardinals Rotation As Early As May 29, 2018; Updates On Adam Wainwright, Carson Kelly, Dominic Leone, Luke Gregerson, Carlos Martinez, Paul DeJong,Tyler Lyons, & Yadier Molina

Derrick Goold Twitter

One of the biggest questions has been answered, although it raises several more. Upon his return from the disabled list, Alex Reyes will be in the St. Louis Cardinals starting rotation.
STL Baseball Weekly

Prior to the I-70 Series opener against the Royals on Monday, Cardinals general manager Michael Girsch confirmed what was becoming apparent: prospect Alex Reyes' return from Tommy John surgery will come in the Major League rotation.
St. Louis Official Site