Crawford, with 41 wins and 31 knockouts, won his first world title in 2014 at lightweight against Scotsman Ricky Burns. He went on to unify the light-welterweight and welterweight divisions before moving up again.
“This fight is going to be stamped in the history books,” he said, promising to “shock the world.”
Saturday’s bout will be broadcast globally on Netflix, reaching a potential audience of more than 300 million subscribers.
It is the first major boxing event promoted by White alongside Saudi’s Turki Alalshikh, signalling a new, if uncertain, era for the sport.
As organisers hyped up the new partnership as the saviour of the sport and suggested boxing has been suffering for years, one of its biggest stars – and highest earners with a reported $150m purse to collect on Saturday – Alvarez, chimed in.
“Hey, boxing was always bigger, bigger and big. Don’t say boxing is not big enough. You know how big is boxing,” he said.
Alvarez pushed Crawford as tempers flared at in New York in June, but the two shared a nod and handshake to end on a respectful note.