Arenado is not in the lineup for Sunday's game against the Cubs, Patrick Saunders of The Denver Post reports.
Arenado has appeared in 63 of the team's first 64 games this season and will head to the bench Sunday for a well-earned day of rest. Pat Valaika will draw the start at third base in his stead. The starting third baseman should rejoin the heart of the Rockies' lineup Monday at Pittsburgh.