Tyson Fury's promoter, Bob Arum, has confirmed that Deontay Wilder's camp have officially triggered his rematch clause.
This means both boxers will face each other again in July.
"Wilder and his representatives formally notified us last night that they have accepted the rematch and are going forward.
"It's going to happen in the summer, before the Olympics. Middle of July," Arum told Ringside Reporter.
The pair drew their first fight in 2018, before Fury stopped Wilder in the seventh round to win the WBC heavyweight title in Las Vegas last Saturday.
Wilder had 30 days to call for a rematch and now his camp have 'formally notified' their intention for a triology.
It will also put the prospect of an all-British heavyweight unification fight between Fury and Anthony Joshua on hold.