Chicago Bulls forward Nikola Mirotic suffered a fractured jaw and a concussion after fighting with teammate Bobby Portis in practice, the NBA is reporting on its website on Tuesday.
The Bulls said Mirotic would likely require surgery and they were considering disciplinary action over the incident.
Mirotic, 26, had been set to start for the Bulls' season opener on Thursday in Toronto.
He averaged 10.6 points and 5.5 rebounds last season before re-signing with the Bulls on a two-year, $US27 million ($A34 million) deal just before training camp.
Portis, also a forward, averaged 6.8 points last season for Chicago.
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