The heavyweight showdown between Anthony Joshua and Francis Ngannou has been confirmed for March 8 in Riyadh.
However, Wilder suffered a comprehensive points defeat to Joseph Parker, subsequently leading to plans for Joshua and Wilder to meet on March 9 to be scrapped.
Instead, Joshua will face former UFC heavyweight champion Ngannou, with clamour for the crossover fight becoming justified after Ngannou dropped WBC heavyweight champion Tyson Fury before being edged out on points in October.
On Monday, the event was confirmed for Friday, March 8, the proposed date being brought forward by a day in order to avoid any conflict with the Saudi Arabia Grand Prix which is also being staged that weekend.
The chief support will see Parker go up against Zhilei Zhang in what is billed as an interim WBA heavyweight title fight.
A number of other fighters are due to be on the card, including unbeaten Australian heavyweight Justis Huni.