Ron Adams was let go by the Chicago Bulls as Tom Thibodeau's top assistant last June in an unusual move that seemed to highlight a discord between the front office and coaching staff.
Adams had close working relationships with several players, including Derrick Rose.
"It's still a bit mystifying to me," Adams said. "And I don't understand it. And if the intent was to be hurtful to me and my family, it succeeded."
Adams has worked for seven teams over 21 years in the NBA and is now with the Boston Celtics.
The Chicago Tribune reported previously that Gar Forman took exception to Adams voicing displeasure over certain personnel moves.
Adams confirmed this, saying he was told he "made a disparaging remark about the organization outside the walls of the Berto Center."