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However, McGregor has since made a U-turn on his short-lived retirement and will now return to action against Poirier, who he defeated in the first round at UFC 178 in 2014.
UFC 257 will be held on 24th January and will be hosted at the Etihad Arena on 'Fight Island' in Abu Dhabi.
UFC president Dana White held different events on Yas Island in 2020 amid the disruption caused by the coronavirus pandemic.
UFC 257 will be shown on BT Sport Box Office.
BT Sport has confirmed that the event will be priced at £19.95.
MMA fans can now purchase UFC 257 from their TV box using channel 494 or can watch the event using the BT Player.
Sky customers can access the UFC PPV using channel 490 from their Sky box. Virgin Media members can also access the event using their TV box.
Fans can live stream UFC 257 using the BT Sport Box Office app, which can be downloaded on iOS and Android devices and on Mac and PC.
UFC 257's early preliminary bouts will begin at 11:30pm GMT.
Fans can tune in for the preliminary fights from 1am ahead of the main card starting from 3am.
Posted below are the fights confirmed for UFC 257.
Preliminary card (ESPN/ESPN+)
Early preliminary card (ESPN+/UFC Fight Pass)