The team announced the injury Tuesday after Williams was treated by team orthopedist Dr. Lyle Mason.
Williams will travel with the team on its three-game road trip, but won't be able to play against former team Atlanta on Friday.
He left Monday's win over Dallas because of the injury and did not return.
The 6-foot-9 Williams is averaging 8.9 points and 3.5 rebounds for Utah as a starter.
Utah already is missing another starter. Point guard Mo Williams is out six weeks after surgery on his right thumb Friday.