Dr. Richard Ferkel, a noted specialist on ankle injuries, performed the surgery in Los Angeles and it was considered a success. Thompson is expected to make a full recovery.
Thompson, a five-time All-Star, tore his right Achilles tendon during a workout with several NBA players last week in Southern California. He had an MRI the next morning that revealed the severity of the injury.
Thompson, 30, missed all of last season after tearing the ACL in his left knee during Game 6 of the 2019 NBA Finals against the Toronto Raptors. The Warriors were optimistic that Thompson, who has spent more than a year rehabbing the injury, would come back at full strength for the 2020-21 season. Now they will spend another season without him on the court.
The injury is a huge blow for the Warriors, who were an NBA-worst 15-50 last season as they struggled without Thompson and Stephen Curry, who suffered a broken left hand that sidelined him for more than four months.
The Associated Press contributed to this report.