Frelick is out of the lineup for Monday's game against the Cubs.
The Brewers will send the left-handed-hitting Frelick to the bench while the Cubs start southpaw Matthew Boyd in the series opener. After being reinstated from the 10-day injured list Aug. 25, Frelick started in seven of the Brewers' ensuing 13 games and slashed .212/.278/.303 with three RBI and three runs.