British boxer Anthony Joshua has vowed to "get his title belts" after calling his first career loss to Andy Ruiz Jr a "minor setback".
In front of a sellout crowd at Madison Square Garden at New York City, Joshua lost his WBA, WBO, IBF and IBO heavyweight titles to Ruiz Jr after the referee waved the contest off after seven rounds.
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Joshua was dropped four times by Ruiz Jr in what is being described as one of the biggest upsets in heavyweight boxing history.
The Brit's promoter Eddie Hearn said a rematch clause was part of the contract and he expected it to take place "in England in November or December".
"I still want to compete with those men, but a rematch with Andy Ruiz Jr is where we are at," Joshua said.
"I'm still a champ, and I will rectify it to get the belts back. If this was the end of the road I would say yes, but for me it is [about] what is next. It is just a minor setback. The locks on the doors don't change."
If the fight takes place, it will be a career-defying bout, according to Hearn.
"Tonight is all about Andy Ruiz," said Hearn. "Now we'll see what AJ is about. He's got the heart of a lion, I'm sure he'll come back.
"Now we know what fight is next, and we'll see a huge rematch at the end of the year.
"Maybe this is what he needs. He'll have another shot at Ruiz later but he needs to win, it's a must win fight for him now."
However, if the rematch takes place, all four belt might not be up for grabs as the IBF, could call on Ruiz Jr to defend their belt against mandatory challenger Kubrat Pulev.
If the Mexican-American declined the mandatory challenge in favour of another big-money showdown with Joshua, he would be stripped of the title.
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