Undisputed junior middleweight champion Claressa Shields has no problem with making a fight with her amateur rival, WBO middleweight champion Savannah Marshall - but the money has to be right.

Shields, when she was 17-years-old, lost an amateur fight to Marshall.

But since that defeat, Shields won two Olympic gold medals and captured world titles in three weight divisions - including the achievement of becoming an undisputed champion in two divisions.

According to Shields, an offer was made to Marshall in 2018 and the British boxer turned down the fight.

Next month, Shields is scheduled to make her MMA debut with PFL.

Once the MMA debut is over, she is ready fight Marshall.

However, the fight can only happen if Marshall's promoter, Eddie Hearn, offers up enough money. 

"We will not take chump change for a world championship fight of that caliber. Eddie Hearn is saying she's going to knock me out? Whatever! It looks like the fight could possibly happen but we are waiting for Eddie to up the numbers," Shields said to Sky Sports.

"It's looking like the fight can be done. I would love to fight Marshall but it's a business. I'm not going to take less money [for her benefit]. I'm not going to go backwards. That's not my problem. I am a three-weight world champion and a two-weight undisputed champion so I will be paid as such or I will continue to make money in MMA or fight somebody else.

"I'm the champ and I'm in the US. To be fair, she wouldn't be a world champ if I didn't vacate my WBO title. I never lost that belt. I had to vacate it to go for more history. She didn't beat the champ to get her belt. She fought for a vacant belt. I was undisputed at 160-pounds. She could have fought me for the belt but they cried, then the belt was vacant, then she fought Hannah Rankin. Rankin wasn't the champion. I was."

"We made an offer to Marshall in 2018 which she turned down. She seems like she has found her confidence now. She has fought girls with okay records and now feels like she is ready. So hopefully we can make it happen."