The rematch between Tony Bellew and David Haye will take place in London on December 17.
In March, Bellew recorded an 11th-round stoppage win over Haye, who sustained a torn Achilles midway through the bout before continuing until the penultimate round.
The pair have been linked with other fights since that showdown, with Bellew targeting either Andre Ward or Joseph Parker and Haye being associated with the UFC's Jimi Manuwa, but the two heavyweights will now meet again at the end of 2017.
Promoter Eddie Hearn had previously revealed that the O2 Arena was unavailable on a Saturday night until February, and that has resulted in the second instalment of Bellew and Haye taking place on a Sunday evening.
Bellew will likely target WBO champion Parker should he record another triumph over Haye, while two-weight world champion Haye has recently reiterated that he is looking to face Anthony Joshua before hanging up his gloves.