Glenbeigh/Glencar became the third Kerry team in succession to win the All-Ireland Junior Club Football Championship when they defeated Tyrone's Rock St.Patrick's on Sunday afternoon.
In a game which saw four players receive red cards, Glenbeigh, who were favourites going into the match, eventually won by three points.
Despite hobbling from the field at half-time, O'Sullivan managed to finish the game, scoring 1-3.
I got a bad enough rattle 15 or 20 minutes into the game. I knew I wasn't going to be at full strength but it's just one of those days where you've got to plough through it.
He ran into me there at half-time [physio Ciaran O'Shea] and said, 'Was I going to be coming off?' I said, 'Go away from me.' He knew well I wasn't going to be coming off so he strapped me well up.
Remarkably, O'Sullivan - who has four All-Ireland winners medals with Kerry and captained his county to victory in 2009 - said that Sunday's win tops anything which he has done previously in his sporting career.
I've said it before that I didn't really understand how big a run like this could be. This tops anything I've ever done before, which says something because I've been lucky enough to be part of some great days here. It's hard enough to put into words the emotion of this whole occasion and how much it had meant to the whole parish.
Asked about the celebrations to come, O'Sullivan said the team and supporters would be in Citywest tonight and then back to Kerry for further festivities over the next few days.
Ashes Bar in Glenbeigh should be manic this week.
Citywest next, then back home for a couple of hairy nights, I suppose.
You can watch Darran O'Sullivan's interview below.