Via Boston.com:
Malcolm Brogdon won’t participate in the Eastern Conference finals Game 6 due to an injury.
About an hour before the start of the game on Saturday, the Celtics made the point guard officially ineligible.
Joe Mazzulla, the coach of the Boston Celtics, told the media that Brogdon will test the elbow on his shooting arm during warm-ups before Game 6 to determine if he could play.