Robert Williams III injury update: Celtics big to miss 4-6 weeks due to arthroscopic knee surgery, per report | CBS Sports Headlines Robert Williams III injury update: Celtics big to miss 4-6 weeks due to arthroscopic knee surgery, per report Williams is expected back early in the regular season ESN … Continue reading Robert Williams III injury update: Celtics big to miss 4-6 weeks due to arthroscopic knee surgery, per report