Katie Taylor will face off against Chantelle Cameron in Dublin on May 20 in a bid to become a two-weight world champion.
Taylor, the undisputed lightweight champion, was due to meet Amanda Serrano in a rematch on the same date, but the Puerto Rican pulled out due to injury.
Instead, Taylor accepted a bout with Cameron after the English fighter challenged her on social media.
Cameron offered to move up in weight and has now got her shot, which will be the first professional fight Taylor has contested in her homeland of Ireland.
"Once Serrano pulled out this was the natural fight to make," the Irish world champion said.
"It's two undefeated, reigning undisputed world champions going up against each other and I believe that's the first time that's ever happened in the modern era of the sport.
"People have been talking about this fight for a long time now, so I'm delighted it's happening and I'm looking forward to becoming a two-weight undisputed champion."
Cameron has been victorious in all 17 of her professional fights, becoming the UK's first undisputed female champion after defeating Jessica McCaskill in November.
Meanwhile, Taylor's record stands at 22-0 with six knockouts, 17 of those bouts coming in title matches.
The 36-year-old made history alongside Serrano in New York in May 2022, with theirs the first female fight to headline at Madison Square Garden as Taylor won on points.
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