TMZ Sports talked to the 32-year-old UFC bantamweight champ about a week before his second fight with heated rival, 29-year-old Yan, the interim champ.

"I am a certified weapon right now, and ready for battle, and I can't wait to go out there and unleash these tools, and put a little beatdown on this guy that he's been deserving for well over a year at this point, and move on to the victim," Aljamain told us.

Of course, the men fought in March 2021 ... a fight that Aljo was losing, but ultimately won when Petr blasted Sterling with a blatantly illegal knee. But, because Aljamain was losing on the cards and fading in the fight, he's dealt with endless crap online, and as you'd expect, that's bothered the starfighter.

"That's the most frustrating part of this whole thing. It's not being able to compete to shut these guys up," Aljo said.

He even compared himself to a caged animal who isn't able to retaliate because he's chained ... but Sterling says the cage door opens at UFC 273.

"Those chains come free April 9 and I get an opportunity to finally put my hands on this guy, and it's gonna be so rewarding to see the shock in people's eyes when I'm out there and I finally get to put my hands on him and see who is really who."

Sterling, the champ, is a big underdog against Yan ... something Aljamain has taken notice of.

"I know the Vegas oddsmakers got me as a big underdog. This is what everyone wants to go out of their way to tell me. I don't give a s***, at the end of the day, I bet on me. And, I know that betting on me is right. I bet on me the last 6 times and I've won every single time," Sterling said.

Lastly, we asked Aljamain if he had a message for Yan ... and he dropped the A-list actor's name while threatening violence against Petr.

"When they lock that door he's gonna get 'Will Smith'd.' I can tell you that. He's gonna get Will Smith'd. And, after that, it's gonna be a lot worse than what Will did to Chris Rock. It's gonna be a beatdown."