Williams had already been ruled out of Wednesday night's game in Sacramento. The Nets face the Clippers in Los Angeles Thursday and the Jazz in Utah Saturday. He did make the trip with the team.
Williams began getting shots up at practice Monday, but is still feeling pain, the team said. The Nets will have another update when the three-time All-Star's status changes.
Williams, 30, has played just four minutes over the past eight games due to injury, missing the past six.
He is averaging 13.9 points and 6.3 assists on 39.6 percent shooting this season.