- Celtics big man Robert Williams, who is still listed as questionable for Game 6 on Friday, was diagnosed with a bone bruise in his left knee after colliding with Giannis Antetokounmpo in Game 3, head coach Ime Udoka said today. Williams’ injured knee is the same one he had surgery on in March, but that procedure isn’t the cause of his current absence. “There’s no problems with the surgery at all,” Udoka said, per Andrew Lopez of ESPN. “It’s just that specific hit that he took (in Game 3).”