Just hours before the 2017-18 NBA season was set to begin Tuesday night, reports began circulating of a nasty altercation between Chicago Bulls forwards Nikola Mirotic and Bobby Portis at practice. A short time later, the team released a statement indicating that the reports were correct. "Chicago Bulls forwards Bobby Portis and Nikola Mirotic had a physical altercation during today's practice. As a result of the incident, Mirotic suffered a concussion and maxillary fractures. Surgery is likely required. Mirotic is out indefinitely. The Bulls are evaluating disciplinary action. An update will be provided when applicable." Unsurprisingly, the league wants to discuss the incident with Portis, and according to a report from ESPN's Adrian Wojnarowski, the two parties have a call scheduled for Wednesday.