The 33-year-old, 6'4", 260 lb. monster was scheduled to fight Rozenstruik -- a 32-year-old, undefeated heavyweight -- Saturday in Columbus, Ohio.

Then, Coronavirus screwed everything up ... and the highly anticipated March 28th fight was put on ice.

But, that doesn't mean the men ain't gonna scrap ... 'cause Ngannou tells TMZ Sports that he is 100% fighting -- assuming the UFC honcho can find a place that's down to host the event.

"[Dana] said if they find a location, we will be on the card," Francis says.

Ngannou has even found a facility where he can lift and train with his coaches ... 'cause he's planning to step in the Octagon in less than 3 weeks.

"Since we are expecting some potential fight for April 18th, so we have to stay ready. So, we have a closed-door training. Just me and Eric Nicksick, my coach. So, we keep working out."

There's been a crazy amount of speculation about where 249 could take place ... Khabib's manager, Ali Abdelaziz, recently told us the UFC was looking at locations in Africa.

Francis says even he doesn't know where it'll happen ... but if there's a place that's safe, you bet your ass he'll be there.

"I don't know exactly where the fight will take place," Ngannou says, "However, what I do know is wherever it is gonna be, I'm gonna be there."

Please, please, PLEASE, Dana ... lock down a spot for these fights!!