WBO welterweight champion Jeff Horn (17-0-1, 11 KOs) has been getting a lot of heat for calling out fights like Floyd Mayweather Jr. and Conor McGregor - but the Australia star sees no issue with targeting either fighter - because of the money involved and he believes they are winnable fights.

Horn will return on December 13th in Brisbane, when he makes a voluntary debut against once-beaten Gary Corcoran of the UK.

The contest will be the first bout for Horn since his shocking decision victory over Manny Pacquiao from April, before a crowd of 51,000 at Suncorp Stadium.

There was a rematch being slated for the fall with Pacquiao, but it was pushed back because of conflicts with Pacquiao's work schedule as a senator back home in the Philippines.

Horn hopes the rematch can happen in 2018. He wants to set the record straight regarding any controversy over their July fight.

"I've heard rumours that if they're going to fight again it's going to be against me and then Manny to retire," Horn told Nine's Sports Sunday panel. "The one that I really want - I want the Manny Pacquiao rematch - that's the big one."

"I felt on the day that I'd won the fight. I wasn't sure I was going to get the decision on the day but I felt like we'd done enough to get the win."

Right after he beat Pacquiao, Horn called for a fight with Mayweather and he's called for that fight several times in the last few months. And Horn has called for a fight with the UFC's biggest star, McGregor.

Mayweather, 40 years old, retired back August after stopping McGregor, who was making his pro boxing debut.

"If I can land other big names out there ... people get up me about calling out guys like Conor McGregor but he's an easier fight for me and a massive payday so who wouldn't [want that]," Horn said.

"Floyd Mayweather would be frustrating because he's so good defensively, but I think he's past an age. I think I would beat him now but in his prime he would've been extremely difficult to fight."