Tyson Fury's promoter Frank Warren has denied growing speculation that Deontay Wilder could be drafted in for a fourth fight with the Gypsy King - if talks break down with the representatives of Oleksandr Usyk.Usyk's promoter has flown into the UK this week for crunch talks to keep the undisputed heavyweight clash on track. The sticking point on the fight is not the location but the split in purses.However, with the highly-anticipated heavyweight clash yet to be agreed World Boxing News have reported that Wilder has emerged as a potential replacement for Usyk.Warren has denied that any 'secret talks' have happened between the parties for a fourth fight between the heavyweights.READ MORE: Oleksandr Usyk's team head for UK to end Tyson Fury impasse - with Wembley now realistic“Not to my knowledge at all, not to my knowledge," Warren told talkSPORT.