The Web site, citing a source familiar with the situation, said Hjalmarsson was disciplined after his hit on Buffalo Sabres forward Jason Pominville Monday resulted in Pominville being taken off the ice on a stretcher.
Pominville sustained a gash in his head and was diagnosed with a concussion after the hit along the glass in the Blackhawks' 4-3 win.
Hjalmarsson received a 5-minute penalty and a game misconduct for the hit.
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