The plan also retains promotion and relegation to and from the Championship from the division below, allaying fears the top two divisions are to be ring-fenced.

BBC: Championship plan gains support

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 36-year-old stepped up to the light-heavyweight division to fight Bernard Hopkins in Las Vegas in April where his points victory won Calzaghe the prestigious Ring Magazine title.

BBC: Calzaghe ready to cement legacy