IBF, WBA, WBC middleweight champion Claressa Shields has taken another direct shot at her career rival, WBO champion Savannah Marshall.

This coming Saturday night, Shields will make her UK debut as a pro, when she faces mandatory challenger Ema Kozin in Cardiff.

The fight will be featured as part of the undercard to the middleweight grudge fight between Chris Eubank Jr. and Liam Williams.

Should Shields win, a fight with Marshall is being lined up to take place in the summer.

Marshall defeated a young Shields in the amateurs - which is still the only defeat suffered by Shields as an amateur or a pro.

Shields does not view Marshall as a world champion, because the British boxer captured a title that Shields had vacated.

"Oh yeah [a fight with Marshall is what I want next]," Shields told Sky Sports. "See this is the [WBO middleweight] belt that she fought for that was vacant because it was mine.

"This is my belt. So Savannah Marshall is not even considered a champion to me. I win, she wins her next fight, me and her scrap together next, that's what the plan is.

"She can say whatever she wants, I'm a three-time division world champion. She's a one-time belt holder, only in one weight class, and the reason that this fight is so huge is because of me. Two Olympic gold medals compared to zero is a big deal."

At the same time, the 26-year-old Shields is not overlooking the task at hand.

"I mean she's 21-0, 11 knockouts, she's a worthy opponent and has worked her way to the top, but there's levels," Shields said of Kozin.

"I watched her in the amateurs and I see her in the pros, she's a big tough girl but she's going to get beat up too. I won the Olympics here [London], I don't worry about upsets. I've been in plenty of countries and beat whoever they had there. It doesn't matter where we fight. I can fight in any country. The pressure doesn't bother me, the boos don't bother me, the cheers don't bother me. I come out here to show my skills, defend my titles, and bring it back home to the USA."