The footage went viral when video emerged from a Manchester United fan account that seemed to show the pair get into a grappling match. Ngannou, who stands at 6’4″ just weighed in at 256lb for his MMA comeback, took down 6’3″ Onana and moved him around with ease.

Francis Ngannou humorously responds to Manchester United's Andre Onana, who jokingly requests a rematch after takedown.

As for PFL, the MMA firm concluded its season with a championship event Friday in Saudi Arabia. Dakota Ditcheva announced herself as a surging British MMA superstar-in-the-making with a thumping knockout win over the former UFC title challenger Talia Santos.

Francis Ngannou scares fans with a playful grappling moment with Andre Onana at Old Trafford, creating a viral buzz.

Andre Onana met UFC star Francis Ngannou on the Old Trafford pitch after Manchester United's Europa League win over Bodo/Glimt, with the duo then going head-to-head in a quick fight

Andre Onana is a brave man for wanting to spar with Francis Ngannou - one of the most terrifying heavyweights of his generation. The former UFC champion was one of the big names in the stands at Old Trafford on Thursday night to watch Ruben Amorim's first home game in charge as Manchester United boss.