Chicago Bulls forward Nikola Mirotic out indefinitely due to injuries after fight in practice

CHICAGO (WLS) -- Chicago Bulls forward Nikola Mirotic is out indefinitely after being injured in a "physical altercation" with forward Bobby Portis during practice Tuesday, team officials said.

In a statement, officials said Mirotic suffered a concussion and maxillary fractures. They believe he will likely require surgery. There is no timeline for his return to play.

Officials said the team is evaluating disciplinary actions.

No details about the fight or what caused it have been released.

It's a terrible twist for a team committed to rebuilding a struggling franchise, and head coach Fred Hoiberg's comments during practice over the weekend now seem cryptic.

"In this sport, with as many highs and lows as you go through, through the course of the season, you have a lot of time to correct things with these guys. And again with this group, they've really bought into that," Hoiberg said.

The Bulls, now without Mirotic, are likely to suspend Portis.

Mirotic averaged 10.8 points over his first three seasons with Chicago. A restricted free agent, he signed a two-year contract that could pay as much as $27 million in September. The club holds an option on the second season.

A 2015 first-round pick, Portis has averaged 6.9 points and 5 rebounds.

The Bulls open at Toronto on Thursday. Chicago is rebuilding after trading Jimmy Butler and parting with Dwyane Wade and Rajon Rondo.

The Associated Press contributed to this report.