Arenado is out of the lineup for Thursday's game against the Cubs, Katie Woo of The Athletic reports.
Even though Arenado played just three innings in Wednesday's 7-1 loss before being ejected following his second plate appearance when he argued a third-strike call, he'll get some rest for the day game after a night game. Given that he's started in all 25 of the Cardinals' games since missing the team's two-game series in Toronto in late July, Arenado was probably overdue for a day off. Tommy Edman will spell him at third base.