Boston Bruins defenseman Matt Grzelcyk was shaken up and forced to leave the game after a hard hit from behind by St. Louis Blues forward Oskar Sundqvist late in the first period of Game 2 on Wednesday night.
Grzelcyk was helped to Boston's dressing room by a trainer and his teammates and didn't return.
After the game, Bruins head coach Bruce Cassidy told reporters Grzelcyk was taken to hospital but didn't have any further update on his condition, according to The Athletic's Fluto Shinzawa.
Sundqvist was assessed a two-minute minor, but the league is reviewing the incident with a potential hearing being announced on Thursday, reports TSN's Pierre LeBrun.
Grzelcyk has been a steady piece on the Bruins' third defensive pairing this spring, averaging just over 17 minutes per night and chipping in seven points so far in the postseason.