Couturier suffered a sprained shoulder Monday against the Islanders and is considered day-to-day, Kevin Kurz of The Athletic reports.
Couturier is questionable for Friday's tilt in Buffalo. The 31-year-old has 11 goals, 25 assists and 182 shots on goal in 70 appearances this season. Look for Bobby Brink to get back in the lineup should Couturier be unavailable against the Sabres.