The Celtics will be without Grant Williams for one game -- the NBA just suspended the forward after making contact with a referee during Boston's matchup against the Bulls this week.
The call was made during the 4th quarter of the Celtics game on Oct. 24 ... after Williams was charged with a blocking foul against Zach LaVine.
The 6'6" baller disagreed with the call and unintentionally bumped into referee Cheryl Flores as he got up with frustration.
Williams was immediately ejected for making contact .