Australia superstar Tim Tszyu expects to become the full WBO world champion at 154-pounds.

At the moment, Tszyu holds the WBO's interim-world title.

The undisputed champion at the weight, Jermell Charlo, will move up by two weight divisions to challenge undisputed super middleweight champion Saul 'Canelo' Alvarez on September 30 in Las Vegas.

Charlo was ordered by the WBO to make a mandatory defense against Tszyu by the end of September. Whether Charlo wins or loses against Canelo, many expect Tszyu to be elevated to full champion by the end of the night.

“I feel like once he gets into the ring (against Canelo) he will be stripped straight away,” Tszyu told Fox Sports Australia.

“I think that fight’s undisputed v undisputed … it’s the marketing part of the fight and we all know that’s how this boxing game works. But I will be the WBO world champion (afterwards) – 100 percent, guaranteed.”

Tszyu is backing Canelo to take Charlo down.

“I think he gets his ass whooped. Charlo is gonna lose. (But) he was going to lose his next fight no matter what. It was either me or Canelo. So he decides to take the one with the bigger payday – simple,” Tszyu said.

The fight between Canelo and Charlo was a big surprise to many - including Tszyu.

Canelo was widely expected to face older brother Jermall Charlo, who holds the WBC middleweight title. However, Jermall indicated to all parties that he was unable to get ready in time to make the September date. Jermell raised his hand to take the big fight.

“I was at home, saw it on Instagram and thought ‘nah, they’re taking the p… aren’t they?’,” Tszyu revealed.

“Then I went to Canelo’s page and it said undisputed versus undisputed. I thought ‘what?’ Straight away, I called to my manager, nobody picks up. So I call to the promoter and they explain, then my manager explains. I was in a state of shock. Couldn’t believe it. But after a few days of that anger, I moved on.

“When one door closes another opens, and I’m 100 percent positive there are bigger things on the horizon than little Charlo.”