30-year-old Royval served as the backup to the co-main event between AP and BM -- training and cutting weight, in the event either of the competitors couldn't fight -- and while he hasn't been told he's next, Royval says his team thinks that's the case.

"I haven't been told necessarily anything," Brandon told us ... "As far as my management team goes, he's like, 'I'm pretty positive you're next, who else, you know? Which is pretty dope because me and Moreno have the same management team."

FYI, both men are repped by Iridium Sports CEO Jason House.

Of course, a rematch between Pantoja and Moreno is also on the table ... but as Royval points out, the guys have already fought three times (2016, 2018, 2023), and the score is 3 to nill.

Not to mention Royval doesn't believe the fight with Moreno was very close, saying he scored it four rounds to one for Alexandre ("I thought the judges f***ed up").

As for how a scrap would look between Royval and Pantoja -- despite losing to AP in 2021 via submission -- Brandon thinks he's got a big-time advantage, and it's his fight to lose.

"There's holes all over all their games," Royval said.

"Watching them fight, I'm like, 'Damn, this could be great for me. They could be walking into some dangerous shots and putting themselves in dangerous positions.'"

The takeaway, Brandon says ... "I know I could be both those guys."

With that said, if it sounds like there's beef between Royval, Moreno, and Pantoja ... that's not the case.

BR says he was touched emotionally by Alexandre's win ... that's how special it was to see him realize his lifelong dream of becoming champion.

"F***ing awesome job," Royval said of AP's performance, adding ... "The moments I've had with Pantoja outside the cage have been such beautiful moments. And that guy's such a good person. Same thing with Moreno."

Brandon continued ... "What a beautiful moment, man. And to watch him win and to watch his family go in and to hear him say what he said was such a beautiful, inspiring moment in my life."