The man Devin Haney beat for three of his lightweight titles thinks Haney is done fighting at the division’s limit of 135 pounds.

George Kambosos Jr. consequently expects to eventually fight for one of the four titles he anticipates Haney will vacate, probably the IBF belt. The WBC has given Haney until the end of business Friday to decide whether he’ll defend its 135-pound crown against mandatory challenger Shakur Stevenson in Haney’s next fight.

Haney (30-0, 15 KOs), of Henderson, Nevada, also owns the IBF, WBA and WBO lightweight titles. The 24-year-old Haney has publicly discussed moving up to the 140-pound division to challenge WBC super lightweight champ Regis Prograis (29-1, 24 KOs) in his next fight.

Kambosos isn’t sure who Haney will fight when he returns to the ring later this year, but the Australian contender is convinced that the 5-foot-9 Haney has squeezed his body down to 135 pounds for the last time.

“I believe the titles will be vacant,” Kambosos told BoxingScene.com. “I believe he’s gonna move up. He’s a very big 135-pound fighter. Obviously, we saw it in the weight cuts, especially in the second fight with me and Devin. It was a very tough weight cut for him. I couldn’t believe, you know, the way he came into that weigh-in. I said, ‘I’m just gonna touch this guy and he’s gonna go down,’ the way I was feeling.

“But he’s got a very good team, a very professional team, great dieticians and great coaches. I think his next move has to be at 140. He’s gonna vacate those belts and we have put ourselves in a great position right now to be fighting for one of them vacant belts.”

Kambosos (20-2, 10 KOs) has lost back-to-back 12-round unanimous decisions to Haney. He’ll fight for the first time Saturday night since Haney won their rematch decisively October 16 at Rod Laver Arena in Melbourne, Australia.

Sydney’s Kambosos is scheduled to encounter England’s Maxi Hughes (26-5-2, 5 KOs) in a 12-round fight for the IBO lightweight title at FireLake Arena in Shawnee, Oklahoma. Their ESPN main event is also an IBF elimination match, which will advance the winner closer to an IBF title shot.

Haney has offered Kambosos some pointers prior to his return from losing their 12-round rematch.

“Devin himself has reached out when he seen me doing certain things in the gym,” Kambosos said, “and obviously on social media, saying, ‘Try this. Try that.’ So, we both have a lot of respect. I gave him a hell of a fight, especially in our second fight.”

The 30-year-old Kambosos wasn’t surprised to have Haney reach out to try to help him.

“There’s a respect there,” Kambosos said. “At the end of the day, like he said straight after the fight, he was very respectful and he said, ‘You changed my life.’ And I said, ‘Hey, you changed my life, too,’ so there’s a lotta respect there. I think even with the buildup of the first fight, you know, as much as I was trying to promote the fight and I was a bit crazy in saying certain things … there was always a lotta respect from each other. Moving forward now, it’s been good. Obviously, I supported him when he fought [Vasiliy] Lomachenko [on May 20]. I came in [to Las Vegas] and watched the fight. And obviously he’s supporting us in our next fight.”

Kambosos-Hughes will headline an ESPN telecast scheduled to begin at 10 p.m. EDT (7 p.m. PDT). Fast-developing lightweight contender Keyshawn Davis (8-0, 6 KOs), of Norfolk, Virginia, will battle Belgium’s Francesco Patera (28-3, 10 KOs) in the 10-round opener of ESPN’s doubleheader.

Full coverage of the Kambosos-Hughes undercard will start on ESPN+ at 5:40 p.m. EDT (2:40 p.m. PDT).

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.