The Cardinals have a lot of well-documented questions to answer in the rotation for 2019. As of today, there are two open slots, previously occupied by Michael Wacha and Adam Wainwright. Per Tuesday’s press conference, the Cardinals appear to be working on a reunion with Wainwright. Assuming the two sides reach agreement, that fills one requirement. The team has multiple options for the final spot in the rotation, but they have a pretty good solution already on the roster.
Plan A is almost certainly the return of Carlos Martinez to the rotation.