Grzelcyk (upper body) left Sunday's game against the Predators in the first period and won't return, the team announced.
Grzelcyk got caught up high in a scrum after the whistle in the opening period and has been ruled out for the rest of the game. The 32-year-old has no goals and 12 assists in 68 games in his first season in a Blackhawks sweater. It remains to be seen if he will be forced to miss any more time. Chicago is next in action Tuesday on the road against the Islanders.