Jermaine O'Neal and Phoenix Suns general manager Lance Blanks had a heated, expletive-filled confrontation in the coach's office on Monday, according to league sources.
"It was really bad," one Suns source said Tuesday afternoon.
The confrontation took place after Lindsey Hunter's first practice as interim coach of the Suns.
There has been unrest within the Suns' organization.
O'Neal won't accompany the Suns on their trip to Sacramento.