The UFC honcho provided the update during his appearance on Mike Tyson's "Hotboxin'" podcast this week ... saying he did, in fact, talk to the folks in Italy about bringing the billionaire brawl to one of the Seven Wonders of the World.
"I actually did have a meeting with the Minister of Culture's team in Italy to actually hold that fight in the Colosseum if it would happen," White said. "We're talking."
TMZ Sports broke the story back in June -- sources told us administrators in charge of the landmark location initially reached out to Zuckerberg, who then connected them with Dana's people.
The Ministry of Culture's Office claimed at the time there had been "no formal contact" between the two sides ... but we were told there were conversations that occurred, and now White is confirming it himself.
As for the fight, White believes it can rake in more than a billion dollars in revenue ... saying it's an event everyone in the world wants to see.
"Think about how big that fight is -- two of the richest, most powerful guys in the f***ing world are gonna fight on the biggest stage ever," Dana said.
"Who the f*** doesn't wanna see that fight?? ... That's the kind of fight your f***ing grandmother would watch that fight."