Hoffman first sustained the injury in Round 23 against the Sydney Roosters at Olympic Park, and he subsequently missed the next two games.
He returned for the final home-and-away game against the Rabbitohs, and played in the qualifying final defeat to the Warriors, and the semi-final win over the Broncos.
However the high ankle sprain progressively worsened and in the end the decision was made for Hoffman to have surgery.
â€œHeâ€™s had the surgery and is recovering at home and the initial prognosis from his surgeon suggests the operation was a success,â€ said Storm high performance unit manager Mary Toomey.
â€œWe will now monitor his recovery and we expect heâ€™ll be right to return to pre-season training.â€