Anthony Joshua must reach a deal with Kubrat Pulev before the end of the month.
The Brit is eyeing his next opponent after regaining his world heavyweight titles by beating Andy Ruiz Jr in Saudi Arabia in December.
Joshua has been ordered to put his titles on the line against mandatory challengers Pulev and Oleksandr Usyk.
Pulev is the mandatory challenger for the IBF title and appears to be next in line while Usyk is next in line for the WBO crown.
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A spokersperson for the IBF confirmed both fighters have been given until the end of January to agree terms on a contract.
“I have just been told that the Pulev and Joshua camps have asked until January 31 to negotiate,” they told Sky Sports.
Joshua was due to face Pulev in 2017 before the Bulgarian pulled out due to injury.
