Anthony Joshua’s heavyweight title fight at Wembley against Wladimir Klitschko could generate a record gate of £8m ($9.9m/€9.5m).
Promoter Eddie Hearn has permission to sell 80,000 tickets for the event, however he will request authority from London Mayor Sadiq Khan to release another 10,000.
Should permission be granted, the attendance could match the UK record of 90,000 for the light-heavyweight bout between Len Harvey and Jock McAvoy at White City Stadium in 1939.
"London mayor Sadiq Khan was at the Boxing Writers' Club dinner talking about how he wants to bring major fights to London, so he better help us out,” Hearn said.
The first 50,000 tickets went on sale last week via Wembley and StubHub and were snapped up within minutes. The second tranche are to become available on January 16.
Tickets start at £40, although some are already selling for many times that value on secondary sites.