WBA and IBF world heavyweight champion Anthony Joshua expects to face WBO title holder Joseph Parker in a unification bout in March or April.
The Briton’s team have been in negotiations with representatives of Parker over how the potential bout’s revenue should be divided.
The New Zealand fighter wants 35% and his promoter says a deal is “close”.
“Joseph Parker is being very realistic in terms of when he is going to fight and in negotiations,” said Joshua.
A date in either month will make Cardiff’s Principality Stadium a front-runner to stage the event as it boasts a roof, and the magnitude of a heavyweight unification bout will undoubtedly demand a capacity greater than the 20,000 offered by London’s O2 Arena.
Joshua defended his titles in Cardiff by stopping Carlos Takam in October, prompting his promoter Eddie Hearn to state the Welsh capital could become a regular winter fight venue for the London 2012 gold medallist.