Ukraine's Wladimir Klitschko wants to become undisputed world heavyweight champion by claiming the WBC crown vacated by his older brother Vitali.
Briton Lennox Lewis was the last boxer to hold all the major belts in 2000, as the Klitschko brothers chose not to fight each other.
Klitschko says his aim is to bring the WBC title back into the Klitschko family.
This month, the older Klitschko swapped boxing for politics.
The 42-year-old is a Ukrainian opposition leader and plans to run for president in 2015.
However, he was named "champion emeritus", which would allow him to directly challenge a new champion if he wants to resume boxing.
The younger Klitschko beat Alexander Povetkin in October to retain his WBA, IBF and WBO world heavyweight titles.
The 37-year-old has made 15 defences in his second spell as champion and has won 61 of his 64 professional fights, 51 by knockout.
In comparison, his older brother has won 45 of his 47 professional fights, 41 by knockout.
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