Alex Krassyuk, promoter for Oleksandr Usyk, says the mandatory fight with Anthony Joshua is close to being finalized - with "three small issues" remaining.
Joshua is slated to defend the IBF, IBO, WBA, WBO heavyweight titles against Usyk, the former undisputed cruiserweight king, on September 25.
Usyk was not overly impressive in his October decision win over division veteran Derek Chisora.
Based on his last few fights, most observers have tabbed Joshua as a solid favorite to come away with the victory in their anticipated encounter.
To raise his level in the upcoming fight, Usyk has retained the training services of Anatoly Lomachenko, who is father and trainer of three division world champion Vasiliy Lomachenko.
"According to my experience in boxing, the fight is done when both fighters enter the ring and the bell sounds. We just have three small issues to co-ordinate, which we're going to do tonight," Krassyuk told Daily Mail.
"We have a conference call to fix everything and to proceed with signing [contracts]. [It's] some small risky things, which are not likely to happen. But we are professionals and we need to secure even the lowest possibility issues. That's why we keep saying, 'The principal things have been coordinated a long time ago.' But all those small issues are in progress. Nothing major.
"We keep saying we're going to make it within a couple of days. But the issue is our lawyers are in the United States, we're in Ukraine, [AJ's] guys are in the UK. We don't need to talk much, we just need to agree on small issues and to proceed further."