Arenado was removed from Friday's game in the fifth inning when he tweaked his shoulder on a throw. The five-time Gold Glove winner has been bothered by the shoulder for about a week.
The 27-year-old Arenado entered Saturday's game as a pinch-hitter in the ninth and was hit by a pitch. Later, Ryan McMahon -- his replacement at third -- hit a walk-off, three-run homer.
Arenado is hitting .307 with 29 home runs and 82 RBI this season.