The Leeds Warrior will face undefeated Dane Dennis Ceylan in an IBF featherweight title eliminator at First Direct Arena on October 21.
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Warren believes this could be the fight where everything clicks for Josh and 'transports him to a new level' - the final step towards a shot at the IBF world featherweight title, a blockbuster clash with current champ Selby.
Warrington, a former Commonwealth featherweight champion, has beaten Joel Brunker, Hisashi Amagasa, Patrick Hyland, and former world titleholder Kiko Martinez in his past four fights.
Ceylan is a former Olympian, competing at London 2012, and also the European featherweight champion, winning the vacant title against Ryan Walsh last October.
Warrington returned from a 10-month lay-off when he made his debut under new promoter Warren in May and made the third defence of his WBC International Featherweight belt. against Martinez.
Warren says they have made a hefty offer to Selby's team and financial terms were agreed but they were not prepared to succumb to various other stipulations, so opted to force the issue by going down the mandatory route.
"To that end, the IBF ordered a final eliminator against the unbeaten Ceylan and the winner of the fight gets the keys to the gate and Selby – or whoever is champion early next year – will have no alternative but to take on the mandatory challenger if he wants to keep his title," Warren explained.
"If we cannot agree terms next time around, we will go to purse bids and it will be a straightforward process. There will be no giving away options on future fights or agreeing to vacate the title in the event of Selby getting beat.
"We have invested a lot of time and money in bringing top quality boxing bills back to Leeds, we are working hard on it in conjunction with a good group of people up there and we just want it to be a success story.
"Josh knows that securing the mandatory spot is not a foregone conclusion and there is an equally ambitious opponent standing in his way.
"Due to the question of Selby being asked and answered, Ceylan probably believes he is being overlooked a bit, but it is not in Josh’s nature to focus on anything but the job in front of him.
"I believe this could be the fight where everything really clicks for Josh and transports him to a new level. He never made any sort of fuss when he banged his hand up very badly during his last fight against Kiko Martinez and he still came out punching right to the final bell.
"Ceylan means business too and I looked at them both when they were eyeballing each other and he didn’t blink for a second. I’m telling you, he really fancies it.
"October 21 will be a top class show, with excellent main events and competitive fights right down the card.
"This, of course, is good news for the fans in the arena and those watching on BT Sport and BoxNation."