Deontay Wilder just has to “add his signature” to a contract to fight Anthony Joshua on 13 April, says Matchroom Sport chief Barry Hearn.
IBF, WBA and WBO world heavyweight champion Joshua has agreed to defend his titles against Alexander Povetkin at Wembley Stadium on 22 September.
Joshua, 28, is contracted to fight at Wembley in April, but no deal has been reached with WBC title-holder Wilder.
“Wilder has to ask: ‘Do I really believe I can beat him?'” said Hearn.
Hearn, whose son Eddie promotes Joshua, added: “Wilder’s making a few million dollars a fight.
“Sooner or later the penny will drop where he says: ‘I’ve been offered $15m, so every other fight I take I’m losing $10m and I believe I can beat him. If I beat him, the rematch is at 50-50 for sharing $100m and if I beat him twice, I’m the biggest thing in American sport.’
“So does he roll the dice or negotiate over a few million dollars? Joshua has signed the contract, all Wilder has to do is add his signature and 13 April at Wembley is done.”