On Saturday night, two of Britain's most explosive junior welterweights will meet over 12 rounds at Dublin’s 3Arena, streamed exclusively live on DAZN.

O'Leary (19-0, 11 KOs) grew up around half a mile from the famous arena and a large, partisan crowd is expected to create a hostile atmosphere for the local hero's first headline appearance at the venue.

Chamberlain (17-1-1, 12 KOs) couldn't care less.

"If it makes sense for me, pay me what I want. I have gloves, a passport and will travel. It's as simple as that," Chamberlain told The Ring.

"I'm not a stranger going to someone's back garden and having a go because it's all good and well someone [a supporter] sat there saying he's going to do this or he's going to do that.

"Mate, you're irrelevant. On the night, it's just me and Pierce in the ring, that's all that matters.”

Chamberlain has never been shy about putting himself in harm's way. During the coronavirus pandemic, he was a 6-0 prospect when accepting a behind-closed-doors fight with the 10-1 Shaun Cooper.

A one-sided win earned him the confidence of Queensberry Promotions. A series of knockouts then saw him handpicked for a Saudi Arabia trip, featuring on the Anthony Joshua-Francis Ngannou undercard in March 2024.

Chamberlain took a major step up in opposition and profile in stride, scoring an impressive fourth-round stoppage of former European champion Gavin Gwynne. It's a result that looks all the more impressive given the tough Welshman's run of form since.

A shock defeat six months later against current European junior lightweight champion Josh Padley didn't make Chamberlain reconsider his risk-taking approach and last August, traveled north to fight the unbeaten Jack Rafferty in an old ice rink on the outskirts of Manchester.

Chamberlain stood up to everything "The Demolition Man" could throw at him and traveled home to Portsmouth disappointed in settling for a majority draw.

Beating O'Leary will make Chamberlain a player on the world scene but it is unlikely to alter his attitude.

"I've made it clear to people that know me, I'll fight anyone if it makes sense," Chamberlain continued.

"I'm not one to say, 'Oh no, I'm not going to fight Pierce, he's unbeaten'. I'm 27, had 19 fights, still got plenty in me but you can't have a fight like Rafferty then go back down the ladder and fight someone from overseas.

"I was offered an eight or 10-rounder to get me back out there and then into this fight, but that person is still capable of coming in with his head and cutting me, or me breaking my hand and then this big one's off the card.

"Let's forget that, jump straight back into a big fight and here we go."