Savannah Marshall has criticised Franchon Crews-Dezurn for not fighting regularly over the last few years.
Marshall is making her return to the ring after her October 2022 defeat to Claressa Shields, and if she wins on Saturday she will replace her 36-year-old opponent as the undisputed super middleweight champion.
Marshall was accused of complacency by Crews-Dezurn, something the Briton dismissed before turning the tables at a press conference.
"I didn't get complacent at all," said Marshall. "You're nothing like Claressa, you won't dog-walk me at all.
"The reality of it is I don't have to say anything, I'm a better fighter than you.
"The difference between me and you is you sit about on your lazy a-- waiting for opportunities, this was why you've boxed twice in two years.
"When I was at super-middle you didn't want to entertain me, you didn't want to know so I moved up to light-heavy where there was a title shot for me, fell through. I moved down to middle to box Hannah Rankin.
"Same with Shadesia Green, she sat as your mandatory for over a year and you didn't want to know."