Williams (hand) is out for Boston's game Thursday against Bucks, Zack Cox of the Boston Herald reports.
Williams needs to miss at least one contest due to a hairline fracture in his hand. It's unclear how much time he'll be sidelined with the injury, but the two-way player appears to be getting evaluated on a day-to-day basis after missing the Maine Celtics' G League win over the Capital City Go-Go on Wednesday.