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.

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."