Former unified world heavyweight champion Tyson Fury will compete against Braun Strowman at a WWE event in Saudi Arabia on October 31.
Fury, 31, has appeared twice on WWE in recent weeks and has already started a feud with Strowman.
Speaking at their bout announcement, Fury said: "I have no fear. I'm going to knock Strowman out."
Strowman, whose real name is Adam Scherr, said: "Tyson heed my warning. In the WWE, we don't wear gloves."
He added: "You are climbing into my world. You are a household name and when these hands are put down for good, the whole world will remember who the monster among men is Braun Strowman."
WWE, UFC and boxing in Saudi
Fury said he was "honored" to compete in WWE and described himself as a "lifelong fan" of the sports entertainment organization.
WWE champion Brock Lesnar – a former UFC heavyweight champion – will also face UFC's Cain Velasquez at the event, which has been named Crown Jewel and will take the place in Saudi capital Riyadh.
The Saudi Arabia matches were confirmed by wrestler and WWE executive Triple H, who insisted the night would "bring the UFC worlds, boxing and WWE together in a way that only WWE can".
Fury maintained his unbeaten record with a point win over Sweden's Otto Wallin in September but during a dramatic bout, sustained a cut that required over 40 stitches.
He is expected to enter a rematch with WBC world heavyweight champion Deontay Wilder early in 2020.
In entering the WWE, he follows former boxers Mike Tyson and Floyd Mayweather, while US President Donald Trump has also engaged in a bout for the organization in 2007.
The fact Fury's fixture takes place in Saudi is likely to prompt criticism as his fellow British heavyweight Anthony Joshua has come under scrutiny since announcing he will fight Andy Ruiz Jr. in the kingdom on 7 December.
Amnesty International has pointed to an "abysmal human rights record" and critics have accused the country of 'sportswashing' in a bid to boost its reputation.
High-profile concerts have been held in Saudi Arabia in recent years, as have Formula E events, and the country will stage the richest horse racing event in February.
Crown Prince Mohammad bin Salman has said he wants to reform the country in both social and economic terms as part of his 'Vision 2030' plan and social reforms have included lifting the ban on women being able to drive.