John Fury unloads on KSI and says he's going to 'ruin his career' if he doesn't pay up

John Fury has doubled down on his payment demand from KSI as he has sent ANOTHER chilling message.

A few days removed from his original call out, John has issued a second demand for the payment, claiming he'll 'ruin KSI's career' if he doesn't fork out the six-figure fee.

"He lost. He's got to man up and pay," the 59-year-old exclaimed.

"Cause I will not let this go. I'll hound him to death."

John added: "There you go mate, pay up. You wanted to bet in the first place. Be a man. You was a sore loser when you got picked on the night.

"But you're gonna pay this money. I'll never you leave alone. I will ruin your career. I'm on you like a dog on a rabbit. So don't worry about that. Pay up."

Last week, John referenced Jake Paul as he ordered KSI to pay up following their bet.

"This is a quick video for KSI. You owe me £200,000," he said in a clip posted on social media.

“We had a bet, I want paying. Now don’t be like the other fella, Jake Paul. Be a man and pay your bets. We had a bet live on a podcast, we’ve got all the evidence there, we’ll put it all together.

"You owe me, John Fury, £200,000. I want paying. Thank you very much."

Will KSI pay up? Stay tuned.