Busch is out of the lineup for Sunday's game against the Reds.
Busch will sit for the third time in five games, with all of his absences coming against left-handed pitching. The Cubs appear to be viewing Busch as a pure platoon player, as he's logged just 25 plate appearances against lefties all season and is slashing just .143/.280/.190 in those matchups. Justin Turner will replace Busch at first base.