Even Jeff Horn's next opponent - hard-hitting Briton Gary Corcoran - reckons the Australian boxer did enough to beat Filipino great Manny Pacquiao and claim the WBO welterweight belt.

But Corcoran has vowed to upset Horn's plans for a re-match with the 11-time world champion.

Horn's camp on Monday confirmed the ex-school teacher would defend his world title against the unheralded Corcoran in Brisbane on December 13.

And as a bemused Corcoran looked on, Horn's promoter Dean Lonergan also confirmed Brisbane had officially secured the rights to host the Australian's rematch with Pacquiao.

World No.10 ranked Corcoran surprisingly had Horn's back when asked what he thought of the Australian's controversial win over Pacquiao at Suncorp Stadium in July.

Horn earned an unanimous points victory but wasn't officially declared the winner after an independent review of the judges' scorecards following protests from Pacquiao and the Filipino government.

"It was a good fight, I don't think Pacquiao did enough," Corcoran said.

"He did more running than anything in the fight, so fair play to Jeff, he won."

That's where the pleasantries ended after Corcoran's camp looked less than impressed by Lonergan's Pacquiao rematch announcement.

Corcoran claimed he wasn't disrespected by the Pacquiao rematch call but added: "I think it is a mistake (to plan ahead) - I will show him on the night".

Corcoran's trainer Peter Stanley didn't mince his words.

"We will have to play the villain here. You've made all these lovely plans but we will come and upset them," he said.

"Be careful what you wish for - you want a fight, we will give you a fight."

Horn admitted his head had not stopped spinning since his Pacquiao upset. The boxer has become a media sensation in Australia - where many now view him as a national hero.

"It's become a blur," he said. "But I am always fighting for my family and future, I am very hungry to keep winning."