The world number one is currently 36-year-old American Nate Campbell, who recently beat Juan Diaz for the WBA, WBO and IBF titles.

BBC: Thaxton gets title shot incentive

Calzaghe, unbeaten in 45 bouts, was king of the super-middleweight division - holding the WBC, WBA and WBO titles - but The Ring light-heavyweight crown he won by beating Hopkins was to be on the line against four-weight world champion Jones.

BBC: Calzaghe postpones Jones Jr fight

The recognised world titles at the weight are held by Jean Pascal (WBC), Tavoris Cloud (IBF), Gabriel Campillo (WBA) and Juergen Braehmer (WBO).

BBC: Nathan Cleverly helped to title by leaving Calzaghe gym

His ultimate fight would be Mexican Juan Diaz, who added the WBO lightweight title to his WBA and IBF belts after a technical knockout against Brazil's Acelino Freitas in April last year.

BBC: Khan primed for Kristjansen fight

Haye lost his WBA title in July to Wladimir, who also holds the WBO, IBF and IBO belts -- while Vitali is WBC champion.

CNN: Klitschko: Euro 2012 can change Ukraine

The giant Ukrainian retained his IBF and WBO versions of the title and claimed Haye's WBA crown after a polished display over 12 rounds in the Imtech Arena of Bundesliga side SV Hamburg.

CNN: Klitschko dominates Haye in heavyweight showdown

On the undercard of Maccarinelli's 21 July show in Cardiff, Gavin Rees challenges for Souleymane M'Baye's WBA light welterweight belt and Alex Arthur takes on Koba Gogoladze for the WBO interim super featherweight title.

BBC: Braithwaite keen on Maccarinelli

Haye holds the WBA version of the heavyweight crown, while the Klitschko brothers between them hold the WBC, IBF and WBO belts.

BBC: Bernard Hopkins targets David Haye title shot