Francis Ngannou is the reigning UFC heavyweight champion and is one of the many who have watched Jake Paul take down former stars in the company in the boxing ring.

But while others have dismissed the YouTube star-turned-pro boxer, Ngannou warned those dismissing him that they better start paying close attention to what he’s doing.

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Francis Ngannou of Cameroon interacts with media after his victory over Stipe Miocic during the UFC 260 event at UFC APEX on March 27, 2021 in Las Vegas, Nevada.

Francis Ngannou of Cameroon interacts with media after his victory over Stipe Miocic during the UFC 260 event at UFC APEX on March 27, 2021 in Las Vegas, Nevada. (Chris Unger/Zuffa LLC)

"Honestly, I was impressed by Jake Paul," Ngannou told TMZ Sports. "I didn’t see that coming. I was sure that Tyron Woodley was going to win this fight, you know?"

Paul defeated former UFC champion Tyron Woodley twice – once via split decision and the other via knockout after Woodley was a last-minute replacement for Tommy Fury. Paul has not lost since stepping into the ring.

JAKE PAUL CALLS OUT UFC STARS AFTER TYRON WOODLEY KO: 'I’M GOING TO EMBARRASS THEM TOO'

Jake Paul, left, punches Tyron Woodley during the third round of a Cruiserweight fight Sunday, Dec. 19, 2021, in Tampa, Fla.

Jake Paul, left, punches Tyron Woodley during the third round of a Cruiserweight fight Sunday, Dec. 19, 2021, in Tampa, Fla. (AP Photo/Chris O'Meara)

"But you’ve got to give it to Jake Paul. He made a statement, a huge statement and he proved his money is where his mouth is," Ngannou added. "He’s taking himself very seriously. … You better take him seriously because he proved it."

Paul sent a message to UFC president Dana White and called out other stars to get into the ring with him.

Jake Paul, left, looks back after knocking out Tyron Woodley during the sixth round of a Cruiserweight fight Sunday, Dec. 19, 2021, in Tampa, Fla.

Jake Paul, left, looks back after knocking out Tyron Woodley during the sixth round of a Cruiserweight fight Sunday, Dec. 19, 2021, in Tampa, Fla. (AP Photo/Chris O'Meara)

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"I just knocked out a five-time UFC champion and embarrassed your whole company. Please let me get Kamaru Usman. Please let me get [Nate] Diaz. Please let me get [Jorge] Masvidal. Please let me get [Conor] McGregor. Because I’m going to embarrass them too. I promise you that, Dana. I promise you that," he said.