Heavyweights Moses Itauma and Johnny Fisher will feature on the undercard of Tyson Fury’s rematch with Oleksandr Usyk on 21 December in Saudi Arabia.
Itauma will take on Australian Demsey McKean, while Fisher will face fellow Briton Allen.
Both Ituama and Fisher are undefeated in their careers and have been touted as the next generation of heavyweight stars.
Also on the undercard is Dennis McCann, who fights Liverpudlian Peter McGrail in an intriguing super-bantamweight contest.
McCann is undefeated in 17 fights while McGrail has just one loss in 11 contests.
Fisher, 25, takes on a seasoned veteran in 32-year-old Allen, who has six losses, two draws and 23 wins on his record.
Fisher has 11 knockouts in 12 wins, while 19-year-old Itauma will also be looking to extend his stoppage record.
Itauma has eight knockouts from 10 bouts and McKean represents a big step up in quality for the teenage prospect.
The southpaw has one defeat in 23 bouts, with his sole defeat coming to Filip Hrgovic last year.
Fury is gunning for revenge against Usyk and to become a three-time heavyweight world champion, after losing their undisputed contest last May.
