DUBLINER Sean O'Sullivan is nailing his colours to the Kerry mast ahead of the All-Ireland showdown.
Despite being from Dublin, Clontarf man and Under 11 football coach Sean will be proudly cheering on Kerry this Sunday at GAA headquarters.
Although 43-year-old Sean was born in Artane, he has always shouted for the Kerry team -- thanks to his family roots in the county.
Sean says he only supports Dublin is if they're playing against Cork.
"My father is a Kerry-man from Curraheen and I've been supporting them since 1975," he said.
"We go to all the games around the country and we head off on a trip for the day -- leave at 6am and drive to Killarney to see them play."
A Kerry season ticket holder, Sean brings his 11-year-old son Daniel along with him to cheer on Colm Cooper and his teammates.
"Daniel loves it. The only one we have missed this year was the Munster final because we were away on holidays. We had to watch it from a pub in Spain, it really wasn't the same."
The father-of-three is involved in the Dublin GAA scene and even coaches his son and the Under 11s team at their local club in Clontarf.
But Sean insists he will never be a Blues fan.
"I wouldn't begrudge Dublin for winning the All-Ireland, but I don't particularly want them to win -- I'd be raging," he told the Herald.
A passionate supporter, Sean documents every game in pictures, and posts all of his photographs on the Kerry County Board's website for other fans to enjoy.
Unafraid to let his affiliations be known, he decorated his house in yellow and green last week and admits his pals and neighbours have been teasing him: "It's a bit of craic, my friends give me stick about it -- I have flags and bunting up on our house now -- but my wife has a Dubs flag on her car.
"I got my brother to get the biggest flag he could find when he was down in Kerry -- so I have a 5ft flag hanging from the window. I also have a signed jersey by the whole Kerry team -- it's framed and hangs up in our house."
Sean and Daniel will be among the thousands of supporters to turn up to Croker for the upcoming battle.
But the die-hard fan said he is a bit worried about the Munster boys' defence against Gilroy's troops.
"Their defence is a bit vulnerable -- there's a weakness in the centre -- but I definitely think our forwards are better than the Blues," he said.