Bob Arum knew there was no way Andy Ruiz Jr could beat Anthony Joshua as ‘soon as I saw his stomach’.

The veteran promoter, whose Top Rank company has put on many of Ruiz’s fights over the course of his professional career, says the Mexican-American did not act like a professional in his build up to the Joshua rematch after he weighed in at over 280lbs.

Matchroom Boxing 2 Ruiz Jr weighed in 15lbs heavier for the rematch with Joshua than he did for the first fight

Ruiz Jr, who stunned Joshua in their first fight to become heavyweight champion of the world, was outboxed and outclassed by the Brit as he relinquished the WBA, IBF and WBO belts in Saudi Arabia on Saturday night.

“It didn’t surprise me,” said Arum, of Joshua’s unanimous decision victory, speaking to iFL TV.

”Once they announced his weight, I said it is not even worth watching the fight.

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“I’m very familiar with Andy Ruiz and when he came in around 240lbs he was a really good fighter. When he came in close to 300lbs, as he did often, he was a bum.

“Too much weight, no movement and guys who shouldn’t have been in the same ring with him gave him tough fights.

“When I saw the weigh in and the weight for him and saw his stomach, I said to everybody – and George Foreman said to everybody – he has no chance to win. It was a walkover fight for Joshua.

“That doesn’t demean Joshua because he prepared for the fight the way a professional prepares for a fight. Andy Ruiz was a not a professional.”

Getty Images - Getty 2 Ruiz Jr was well beaten by Joshua in Saudi Arabia

Ruiz has faced plenty of criticism after admitting he didn’t prepare well enough for the rematch, and spent too much time partying.

But he has vowed to become heavyweight world champion once again.

“I’ll be back stronger. I WILL be a champion once again,” Ruiz wrote in a tweet on Thursday.

“I appreciate all the love and support from my true fans. I appreciate the haters as well and can’t wait to prove the haters wrong once again.

“Back to the gym. Let’s start this journey to the belts.”