UFC's newest flyweight champ Brandon Moreno is hunting for his next big fight ... telling TMZ Sports he wants to take on the ex-bantamweight champ Cody Garbrandt -- if the dude's willing to drop some pounds.
We caught up with the 27-year-old Mexican star fresh off last month's huge win over Deiveson Figueiredo ... and while "Deus da Guerra" wants an immediate rematch, Moreno says he's got some work to do before getting the trilogy fight.
"I think he needs to fight against another guy because the last fight wasn't even close," Moreno tells us.