Robert Williams is set to miss the next 7-10 days due to a left hamstring injury, said Boston Celtics head coach Joe Mazzulla.
Williams, who has played in just 28 games this season, suffered the injury Friday night against the Nets.
The Celtics expected starting lineup of Williams, Al Horford, Marcus Smart, Jayson Tatum, and Jaylen Brown has appeared together in 10 games this year.