Canelo Alvarez has opened up about his bad blood with ‘little kid’ Julio Cesar Chavez Jr ahead of their grudge match this weekend.

The pair will finally trade leather this Saturday night from the T-Mobile Arena in Las Vegas, live on BoxNation, with two-weight world champion Canelo revealing where the feud between the Mexican rivals originated.

“This rivalry goes back about ten years, you know, to our time in Guadalajara. They had the opportunity to make this fight years ago. They had the power to make this fight back then. They didn’t want to,” said Canelo.

“As a person, I don’t know him well, but just from what I hear from his actions and all, it’s like a guy that just doesn’t sustain what he says. You know, he just says a lot of things. It’s almost like he’s a little kid,” he said.

31-year-old Chavez Jr was equally vocal about the duos long-standing ill will, believing that this fight is the most important of his 14-year career and one he can win by knockout.

“Yes, there’s a real, true rivalry, and on Saturday night, people are going to see firsthand this rivalry, how real it is. Obviously we’re going to show it inside the ring,” said Chavez Jr.

“I do feel that this fight is the biggest fight of my career, just because it’s a big event, because of who I’m fighting and because of the opportunity. I’m going to take advantage of it and make the best of it.

“I feel I can knock him out. I feel that I’m a bigger guy. I fought at light heavyweight. He’s never fought fighters this size, and because of that, if things pan out and I get the right shot, I think of course the knockout can happen,” he said.

Last Saturday in Mexico, Canelo's older brother, Ramon Alvarez, was knocked out by Julio's younger brother, Omar Chavez, in two rounds.

Canelo says he is not affect by the loss.

"No, it does not affect me. Obviously it's my family, it's my brother, we wanted him to win . He lost unfortunately. That's boxing, you win and you lose. And there is only for the future. But it does not influence anything in my fight. I wanted him to win, it's a fight for me brother. But it does not influence me in my fight, it's totally different," Canelo said.