Alexander Krassyuk, promoter for former undisputed cruiserweight champion Oleksandr Usyk, explains that his team is getting frustrated with the lingering situation for Usyk's next fight.
Uysk is the WBO's mandatory challenger to Anthony Joshua.
Joshua is close to finalizing a deal to face WBC champion Tyson Fury in a two-fight series.
The World Boxing Organization had approved a collision between Usyk and Joe Joyce for the WBO's interim-title.
Krassyuk claims the negotiations to face Joyce have been dragging out for too long - and their patience is starting to run thin.
"If AJ vs Fury is not likely to happen this year, or is rescheduled until the end of the year, AJ has to make a mandatory defence against Usyk unless he relinquishes the title," Krassyuk told Sky Sports.
"The WBO has to gather strength and to make the courageous decision - to order AJ vs Usyk. And that will be the triumph of justice. Otherwise boxing will accelerate its decline in popularity due to unfair and preconceived politics.
"Usyk cannot make any move as there's no certainty around. Usyk is doing well, safe and sound, fit and working hard. And is ready to face whoever the WBO legally nominates. But my last conversation regarding Joyce took place in the middle of January. I talked to George Warren. Since that time, we have hardly moved anywhere."
Adam Moralee of SJAM Boxing, who manage Joyce, claims the negotiations with Usyk are ongoing with his manager Egis Klimas.
"I can confirm that SJAM are in conversation with Egis Klimas about the Usyk vs Joyce fight. The management teams of the fighters get on well and talks are progressing. Frank Warren is looped in across all matters as Joe's promoter of record," Moralee said.