Andy Ruiz Jr has vowed to end Anthony Joshua’s career ahead of the rematch in Saudi Arabia.

Ruiz stunned Joshua last June, with a seventh-round victory to take the British fighter’s four heavyweight world titles.

But Ruiz doesn’t want to stop, and has promised he will also emerge victorious in Diriyah on December 7th, suggesting that Joshua quit the first fight between the two.

He told Sky Sports: “I have to [end his career]. If not, he’s going to take my career. It’s either me or him.

“I felt he quit. Because of the way it was going. I think he was still out of it. I don’t think he knew where he was at. I think that he quit.

“I’m confident about the rematch, but I don’t underestimate any fighter. I know AJ’s going to come stronger and more focused but inside the gym, like Mike Tyson says, everyone has a plan until they get hit.”

The next fight is a highly anticipated one, with all the four titles on the line again. It has been billed as “The Clash of the Dunes”.

Joshua has been studying the first bout with Ruiz, but struggles to watch through the moment of defeat: “I can’t count but [I’ve watched it] a lot of times. I stop it at round three now and again.

“But you have to get past that because it doesn’t seem real. You look at it and say ‘come on man you’re better than that, what are you doing?

“I’ve got to take the loss. That’s why I don’t like doing too many interviews, because it seems as though we’re going to start getting into reasons.

“It’s about how you come back. I have a different challenge in my head. When you’ve walked the road once, you can do it again.

“I am looking at myself in the mirror and saying I know I’m better than that [losing last time round].

Andy is still the same person. He will come game and I’ve got to change some of my bits and bobs.”