Frampton, a former world champion, is one of Northern Ireland’s most successful sports stars.
He was first selected to fight for Ireland as a schoolboy, when he had to wear a green singlet vest with a shamrock symbol.
“I never took the thing off me, I wore it every night at training because I was so proud to do that,” he recalled.
But now, he looks back with some regret about missing out on fighting under the Ulster Banner after turning professional.
“I never had the chance to represent Northern Ireland at the Commonwealth Games,” he said.
“I did represent them at the Commonwealth Youth Games, but not as a senior boxer.
“It was always something that, I suppose, upset me a little bit.
“I’m proud to be from Northern Ireland and I did want to represent them and I would have been proud to fight under the Ulster Banner.
“But I don’t think it’s anything I ever thought about too much and I don’t think the flag has really ever been too much of an issue before either.”
Frampton said that if he was still competing he would agree to fight under a neutral flag.
However, he added he would be “a little bit disappointed” because the Ulster Banner is the flag he feels most represents him.
“First and foremost I see myself as a person from Northern Ireland. If you want to call me Irish, that’s fine,” he said.
“If you want to call me British, that’s fine as well and in some ways I identify as all three – Northern Ireland, Irish and British.”