Mikolas (shoulder) is scheduled for a rehab start with Triple-A Memphis on Sunday, Jeff Jones of the Belleville News-Democrat reports.
Mikolas made his second rehab appearance Tuesday and allowed three runs on five hits and no walks while striking out five in four innings. He'll presumably attempt to build up more in Sunday's start and could make his 2021 big-leagu debut as early as the following weekend against the Cubs if everything goes smoothly.