"Lomachenko's next fight supposed to be Dec. 9 at MSG Theater on ESPN. Arum said he has deal for opponent. I'm told it's Rigondeaux," he wrote on his Twitter page.
Earlier, Lomachenko's promoter, Bob Arum, said that Rigondeaux had agreed to move up two weight classes to challenge Lomachenko.
UFC lightweight champion Conor McGregor, who is preparing for a fight against Floyd Mayweather, said which of the modern boxers he supports. "But I like the lighter guys. (Vasyl) Lomachenko and (Guillermo) Rigondeaux is a fight that I'm eager to see," he said.