Promoter Eddie Hearn plans to lure Andy Ruiz Jr to the UK for a rematch with Anthony Joshua.
The new IBF, WBA and WBO heavyweight champion caused one of the biggest upsets in heavyweight history on Sunday (NZT) at New York's Madison Square Garden, when he stopped Joshua in the seventh round.
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A rematch clause is likely to be exercised for a date in November or December, when Joshua had already planned to fight again in the event of victory.
His unsuccessful United States debut had been intended to continue building his profile, but the return bout is likely to happen where Joshua remains undefeated.
Joshua's previous fight had been at Wembley Stadium, but its lack of a roof and the UK winter will probably rule out a rematch there.
The roof at Cardiff's Principality Stadium makes a fight there possible, as is a return to an indoor arena, such as London's O2.
"We didn't know what was coming next in November, December, now we do," said Hearn. "But there's a lot of pressure on that fight - the rematch is huge.
"For me, it should be the UK, but we'll sit down as a team and look at everything.
"Revenge will be sweet and I believe he'll get it."
Joshua ruled out the prospect of accepting a rebuilding fight, before pursuing an immediate rematch
"I'll tidy up, brush off the cobwebs and go again, but it's a minor setback," he said.
"Trust me, where I was at in life, I've dealt with more s*** than this, with some real big losses, and bounced back.
"I'm not dwelling on it. You just correct it, you adjust, you sit down, you focus and you go again."
Ruiz, also 29 and Mexico's first world heavyweight champion, revealed he had long seen flaws in Joshua he believed he could expose.
He accepted Saturday's fight with little more than a month's notice and said: "I'm going to get back in the gym and work even harder.
"I'm actually more motivated, now I'm the champion.
"Before this fight, I always said I wanted to fight Joshua, because I knew I could beat him, I knew he opened up too much. My speed and movement was always going to be too much for him."
PA
