Dana white made a huge announcement overnight as he revealed a blockbuster main-event bout ahead of UFC 304.

The famed Octagon has set up shop in Manchester, England, for tonight's stacked card - headlined by two title fights.

Tom Aspinall defends his interim UFC heavyweight title against Curtis Blaydes and Leon Edwards puts his UFC welterweight championship on the line against Belal Muhammad.

And ahead of the action getting underway in the UK, White took to social media to announce a massive clash for the promotion's UFC 306 (Noche UFC) event.

The UFC CEO confirmed the UFC bantamweight title bout between champion Sean O'Malley and challenger Merab Dvalishvili.

Sean O'Malley is set to defend his UFC bantamweight title at UFC 306. Image: Getty

O'Malley vs. Dvalishvili won't be the only title fight on Noche UFC as UFC women's flyweight champion Alexa Grasso meets Valentina Shevchenko for a third time following their split draw last year. The Mexican star has been champion since submitting Shevchenko at UFC 285 last year.

White also announced Diego Lopes vs. Brian Ortega, which was supposed to take place at last month's UFC 303.

But Ortega fell ill on the night of the fight, with Dan Ige replacing him just hours before their match.

The main-card will also feature Daniel Zellhuber, who has won three fights in a row, against Esteban Ribovics and Ronaldo Rodríguez vs. Ode' Osbourne.

UFC 306 will take place in Las Vegas, Nevada, at the Sphere on September 14, marking the weekend of Mexico's Independence Day holiday.

The Sphere will host UFC 306 on September 14. Image: Getty

White has very, very high hopes for Noche UFC as he believes it will be the 'greatest sporting event of all time'.

"It will be the biggest gate of all time," he said. "It won’t be the greatest UFC event of all time. It will be the greatest sporting event of all time."

The 54-year-old added: "We have assembled the most rock-star team on the planet. When I get you guys in and walk you through what we’re doing. The amount of Oscars, Emmys, Grammys that the team we’ve assembled to pull this thing off. There will be a director who will just be filming the inside of the Sphere to make people feel like they’re there.

"What we are going to attempt to pull off will never, ever be replicated. Nobody will ever do it again. It won’t make sense to try because it costs too much money. It will be one of the greatest things you’ve ever seen live in the arena, and we’re going to try to pull off one of the greatest things you’ve ever seen on TV, too."