Anthony Joshua could make a defence of his heavyweight titles outside the UK for the first time against Jarell Miller in New York.
Four-belt holder had been scheduled to fight next at Wembley on April 13, with fellow Birton Dillian Whyte his most likely opponent.
He would then, in theory, face American Miller in September although talks are ongoing over a possible bout at Madison Square Gardens on June 1 or 8
Miller’s promoter Greg Cohen told ESPN: “Eddie Hearn [Joshua’s promoter] has made an offer and we’ll see what happens.
“Obviously for every fighter, promoter and manager what’s better than fighting for the heavyweight championship of the world?
“We’ve been discussing it for a while, but we now have an official offer. There has been substantial movement on the money and I’m hopeful we can get there, but we’re not there yet. We just have to see if we can get there.”