Mikolas (forearm) will begin a rehab assignment Saturday with Triple-A Memphis, Jeff Jones of the Belleville News-Democrat reports.
The right-hander threw 60 pitches of live batting practice Tuesday, which was the final step in his rehab before pitching in minor-league games. Mikolas has been on the shelf since late May while recovering from the forearm injury, and he's expected to make a handful of starts for Memphis while building up for his potential activation in mid-August.