Heavyweight contender Otto Wallin is not that pleased with the mandatory rematch clause in the upcoming fight with former two-time heavyweight champion Anthony Joshua.

Wallin will finally get his crack at Joshua in the headline bout of a big card on December 23 in Saudi Arabia.

Should Wallin pull off the upset, he would likely have to place his title shot aspirations on hold.

“If it was just up to me, it wouldn't be there of course. I can't say I was particularly happy about it. I'm currently in a really good position in the IBF (International Boxing Federation), so I could have waited and maybe fought for the IBF title, but we got this opportunity that we felt was really good, and if I beat Anthony Joshua once I can beat him again," Wallin told Vegas Insider.

“If I beat Anthony Joshua twice I should be in line to fight for any title out there. So that means I'm kind of giving up my shot with the IBF, but that is okay, considering if I beat Anthony Joshua twice, I could be in line to fight for pretty much any title.”

Joshua has built up a two fight winning streak after dropping back to back fights to current unified champion Oleksandr Usyk.

Wallin does not believe Joshua would be able to recover after suffering two more defeats.

"If he loses to me twice, it'll be very hard for him to come back. This means that he would have been beaten five times. After five losses, he will probably have a very tough time becoming the world champion again, which I know is what he wants," Wallin said.

"I want to do everything it takes to win this fight, and if that means an end to his career, then it is what it is. I want to take myself to the next level. My goal is to become the world champion, so that's what I'm going for."