Eddie Hearn led hundreds of Irish fans in an Ole Ole Ole chant at Madison Square Garden ahead of the Katie Taylor v Amanda Serrano weigh-in.
The Matchroom boss took to the stage with Serrano's promoter Jake Paul prior to the weigh-in at the Hulu Theater on Friday.
Hearn also teased the Irish fans with the possibility of Taylor fighting on Irish soil for the first time as a professional.
He said he would like to see a potential rematch between the pair take place in Ireland at some stage in the future.
Taylor comes into Saturday's fight as the underdog with the bookies for the first time in her career, but she couldn't care less.
She said ahead of the fight: "It honestly doesn't matter to me whether I'm seen as the underdog or the favourite. I don't take any notice of that.
"Even as an amateur boxer and through all these years as a pro I couldn't tell you if I was the underdog or the favourite going into any fight.
"I couldn't care about other people's opinions. All that matters is what I think about the fight and where my mindset is and that's all that matters to me.
"I feel in great shape. I'm ready to put on a great performance and I'm just ready to make history."
Taylor's long-time coach Ross Enamait is usually quite reserved but is very bullish about the 35-year-old's chances this weekend.
The fitness fanatic, who Taylor has worked with in Connecticut since turning professional in 2016, says his fighter has had a "phenomenal" training camp.
He said: "It's business as usual. We've been here before. Katie thrives under the bright lights.
"We're coming to fight. Katie's ready. I've never been more confident in her.
"Everybody says they've had a great camp. We've had a phenomenal camp.
"She hasn't looked better, she's had some phenomenal spars and she is ready to put on a show on Saturday."
He added: "Great fighters are great when it matters and Katie is a great athlete. She's special, she's unique and she's never ducked a challenge.
"We have fought everybody - [Delfine] Persoon twice, , [Christina] Linardatou, [Jessica] McCaskill. She goes after everybody so as big as the event is, it is just another fight because we've been here before.
"Katie is going to go and show the world what she's all about on Saturday."
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