This super-middleweight contest will be contested over 10 rounds in a real 50/50 scrap.
Both men have suffered defeats in their young careers, but will be looking to bounce back in style on this huge platform at the fourth and final Fight Camp.
Who will want it more this Saturday?
The fight lands on Saturday 22nd August
Matchroom Fight Camp, Brentwood, Essex will host the fight.
Cullen, 18-2, has moved up to 168-pounds after narrowly missing out on the Commonwealth strap at middleweight.
The 26-year-old lost to Felix Cash last November in a terrific scrap that saw Cash cut in the third and Cullen dropped twice.
A bounce back win against Tomas Reynoso following in Manchester, lining up this latest opportunity to stake a claim amongst the domestic super-middleweights.
Cullen is growing into his power, recording stoppages in his last six victories.
Chelli is only 22 and is looking to bounce back from his maiden professional defeat.
The Londoner lost to southpaw Kody Davies last September inside London’s historic York Hall, with all three judges favouring the Welshman.
This was Chelli’s first time boxing as a light-heavyweight and has since made the move back down to his preferred 168 pounds.
Chelli is the bigger, stronger man and will try to use his physical advantage over the more technical Cullen.
We expect Cullen to box off the back foot to a game plan and try and edge this victory out on the scorecards.
Either way, we can see this fight going deep.