Jaden Schwartz was not in the lineup Saturday against the Arizona Coyotes due to a lower-body injury.
After Saturday's game, Blues Head Coach Craig Berube said it is tough to say how long Schwartz will be out.
"It's day-to-day right now," Berube said. "He will be re-evaluated (Sunday) and we will see how he's doing."
Schwartz did play in Friday's 4-1 win in Arizona, recording 14 minutes and 4 seconds in the victory.
Through 14 games this season, Schwartz has posted two goals and seven assists (nine points) and a plus-9 rating.