Williams will be re-evaluated in 4-to-6 weeks after aggravating a right hamstring strain during a workout Tuesday, Marc J. Spears of ESPN.com reports.
Williams had been nursing the injury throughout preseason, and the big man's rehab program has now been halted entirely. Oklahoma City has made due without much center depth while Isaiah Hartenstein (hand) has also been unavailable to start the season, so it's reasonable to expect head coach Mark Daigneault to continue leaning heavily on small-ball lineups when Chet Holmgren is off the court.