While many thought that the All-Ireland defeat would finally signal the end of Ó Sé's long career, he rejoined the panel again in 2009. He came on as a substitute in Kerry's National League victory over Derry to capture his third winners' medal in that competition. Kerry's next game was a Munster semi-final meeting with Cork. That game ended in a draw, however, Kerry were well beaten in the replay. 'The Kingdom' were subsequently banished to the qualifiers where they had some unimpressive wins over Longford, Sligo and Antrim. Ó Sé and his squad later lined out in the All-Ireland quarter-final and thrashed Dublin before overcoming Meath in a disappointing semi-final. The subsequent All-Ireland final saw Kerry face Cork for the third time in that year's championship. Ó Sé's side entered the game as slight underdogs, however, they had the trump card of having never lost a game to Cork at Croke Park. Kerry stuttered in the opening period and trailed by 0–1 to 1–3 early in the first-half. The Kerry team stuck to their gameplan while Cork recorded fourteen wides. At the full-time whistle Kerry were the champions again by 0–16 to 1–9. It was Ó Sé's sixth All-Ireland winners' medal, his fifth on the field of play. His contribution to the championship was later recognised when he picked up a fourth All-Star award.