Johnston is out of the lineup for Monday's game against the Cubs.
After going 2-for-5 with a home run, a double, a walk, four RBI and three runs in Sunday's 23-9 win while lefty Jeffrey Springs started for the Athletics, the left-handed-hitting Johnston will head to the bench for Monday's matchup with southpaw Shota Imanaga. Johnston will give up his spot in the lineup to Jake McCarthy (illness), who will return to the starting nine after sitting in the past five games.