D'Arnaud left Saturday's game at Atlanta after injuring his left elbow in a play at the plate in the sixth.
D'Arnaud, who had a two-run single and a solo homer, was hurt trying to tag A.J. Pierzyski, who was trying to score on Nathan Ciarico's fly to left. Michael Cuddyer's throw was up the third-base line, and Pierzynski collided with d'Arnaud, who couldn't hold on to the ball.
D'Arnaud had just returned from the disabled list after breaking his right hand in April. Trainers appeared focused on his left hand before d'Arnaud left the game.
Pierzynski, who was 3-for-3 with a single, double and triple, scored to give the Braves a 5-4 lead.