Kell Brook has accused Amir Khan of being "completely in cuckoo land" over his fight demands, but he is still willing to reach an agreement with his British rival.
Negotiations for the Brook-Khan fight have broken down following a disagreement about the purse split, with promoter Eddie Hearn revealing that a 50-50 offer was rejected by the Bolton fighter.
Khan's claims that Brook "walked away" from talks have been dismissed by the IBF welterweight champion, who is still prepared to take the fight.
"I've been quite vocal over many years that I want that fight. I don't think I would just say I don't want the fight and walk away," Brook told Sky Sports.
"He's trying to find anything to not have the fight and everybody knows that I want that fight.
"I'm willing to bend slightly, even though I've never lost as a welterweight. I've only lost to [Gennady] Golovkin on a broken eye socket.
"I think I'm the main player. I'm the A-side. He got knocked out in his last fight and I don't know how he can kind of call the shots.
Eddie I'm the A side and you and kell know he will make more then he did against GGG. Don't you agree. https://t.co/7TbU05c7bN
— Amir Khan (@amirkingkhan) January 23, 2017
"Just to make the fight happen and get it across the line, I'm willing to bend on some of his demands. Even still, we've not crossed the line with it."
Asked about Khan's requests, Brook said: "Of course it's extreme and not just the split.
"He also wants to have the fight in Bolton. He's also arguing about who comes out first and second. There are many, many things – I could go on all day.
"Seventy-thirty? He wants to give the champion 30 per cent of the cut? He's completely in cuckoo land, that kid."
Brook will take time to consider alternative options, which could include a mandatory title defence against Errol Spence Jr, or a move up to light-middleweight.
"It's so, so frustrating," said the Sheffield man. "Everybody wants this fight so badly and I desperately want to give them this fight. We've come to a dead end at the minute.
"I'm going to get back in the gym now, I'm going to start dieting. I'm going to be listening to my body and see if I can get down to a certain weight, so many weeks before the fight when we're making welterweight.
"I'm just going to see if we move to 154, or if we fight Spence. I'll probably be able to let you know in the next two or three weeks where I think we will be going."