The two have spent the past fortnight firing off insults, with Gallen delivering the final verbal volley at Tuesday's explosive weigh-in in Wollongong.

Fed up with being repeatedly dismissed as a "footballer" by Browne, Gallen hit back after the one-time world heavyweight champion dubbed the rugby league great "Peptide Paul".

Gallen was banned for taking peptides during Cronulla's infamous drugs scandal a decade ago and Browne is not letting the Sharks' only-ever premiership-winning captain forget it.

"Peptide Paul wants the p*** test so here we are," Browne said of Gallen's call for a pre-fight drugs test on Wednesday.

"I'm just going to belt him, there's no two ways about it. I'm angry, I'm p***ed off. I'm just going to try and punch him in the face."

Gallen, though, said it was ironic his opponent had called him a drug cheat given Brown has twice tested positive to banned substances during his own chequered career.

"It's funny, he's an absolute junkie," Gallen said.

"He's a two-time cheat so ... anyway, we'll move on. The chat's done. We'll get in there and bang it out tomorrow and I'll come out victorious."

Undefeated in his 11 professional fights, Gallen weighed in at a touch more than 102kg, some 15kg lighter than Browne.

He is also conceding 16cm in height to Browne, but remains typically unfazed.

"I don't think I've had a fight where I've been heavier than the other guy so I've always been lighter and I've got no issue with it at all," said Gallen, who insists he is living inside Browne's head.

"His mind's all over the place. He's not mentally ready, he's not physically ready, he's taking me for granted.

"He might have heard some stories over the past couple of weeks so he's picked his training up but it's too late if he hasn't done the work already.

"He's relying on his natural talent and power. That's all he's relying on and he's relied on that most of his career and he's gotten away with it because he hasn't fought a professional athlete.

"He hasn't fought someone who's done the work.

"He's fought guys who are scared going into it and he's always got the victory. He won't have that this time."

Australian Associated Press