Sergey Kovalev is the latest pro fighter who wants a piece of Jake Paul ... the ex-boxing champ tells TMZ Sports he's down to fight the YouTuber after his next scheduled match.
"Fight with Jake Paul? I'm ready," the 39-year-old former light heavyweight champion said. "And I will knock him out."
Paul has insisted he wants somebody with a name brand for his next bout -- and while Sergey might not have the biggest social media following, he certainly has the resume Paul is looking for.
"Krusher" is 34-4-1 in his 39 career fights -- and has a win over boxing legend Bernard Hopkins on his resume. He's also fought Canelo Alvarez and Andre Ward in his impressive career.
Kovalev says he's all for trying to add Paul to that list of opponents -- saying he'll be happy to try to make the fight after he returns from his long layoff against Tervel Pulev in May.
"Let me make my comeback fight," Kovalev said, "and then we can do any fight."
He added, "Any day."
Paul previously told us he's targeting an MMA fight with Conor McGregor for his next bout -- but now that Sergey's actually interested ... let's make this one happen first?