In a few weeks, Devin Haney will take part in the biggest fight of his career - when he defends the undisputed lightweight crown against former three division world champion Vasiliy Lomachenko.

The event takes place on May 20. at the MGM Grand in Las Vegas, Nevada.

Some believe the fight, win or lose, would likely become the final bout of Haney's career at 135-pounds. A move to junior welterweight is viewed as a strong possibility.

But, should he win later this month, there are still some major fights that await Haney at 135.

Haney admits that the "only way he stays at 135" is for a fight with "Shakur Stevenson" or "Gervonta 'Tank' Davis."

"That depends on how it goes on May 20, first coming out of the fight successfully and then we'll go from there. But the only way I'm going to stay at 135 is because of guys like Stevenson, or guys like Tank," Haney told ESPN Deportes.

"I don't plan to be here much longer. This has been my first weight class. I've been at 135 since I was 16 years old, My body has been maturing. I've been saying this for a long time.

"I have the best team in boxing. I have a great nutritionist, I'm going through all the steps to do it successfully, but you never know what happens in the ring. I feel good, I feel healthy, I feel strong."

Last year, the 24-year-old Haney unified all four division belts with a dominant decision win over George Kambosos. A few months later, he outboxed Kambosos for a second time in a contracted rematch.

After his recent victory over Japan's Shuichiro Yoshino, Stevenson challenged Haney to a world title showdown.

Haney was not surprised by the callout. 

"That's what he was supposed to say. [Shakur] is a competitor. Now we're in the same weight class. I'm the champion with all the belts, that's what he was supposed to say," Haney said.

"There were times where I wanted someone to challenge me, where I wanted someone to fight me. So when a guy says he wants to fight me, I can't get mad about it."