Mills will start Sunday's game against the Cardinals, Maddie Lee of NBC Sports Chicago reports.

EDGE Analysis

Kohl Stewart was demoted after a rough start Friday, leaving a gap in the Cubs' rotation in the short term. Trevor Williams (abdomen) and Adbert Alzolay (finger) could return in the not-so-distant future, so this could be just a spot start for Mills. He threw six shutout innings with four strikeouts at Triple-A on June 2, so Mills could conceivably go deep enough to qualify for the win.