British Nigerian boxer Anthony Joshua will face MMA fighter Francis Ngannou in a heavyweight contest on 8 March in Saudi Arabia.
Joshua, 34, had previously described a potential bout with Cameroon-born Ngannou as a “gimmick fight”
The 37-year-old former UFC champion only made his professional boxing debut in October, when he knocked down Tyson Fury before losing a close decision.
Former UFC heavyweight king Ngannou stunned the boxing world last year when he sent the undefeated Fury to the canvas with a left hook.
The 35-year-old Briton, who recovered to win the 10-round bout by split decision, will fight Oleksandr Usyk on 17 February for the right to become the first undisputed heavyweight champion since 1999.