London faces competition from "four other regions" for the right to stage the ATP World Tour Finals from 2016.
ATP chief Chris Kermode told BBC Radio 5 live Sport that discussions about the future venue of the season-ending tournament are currently taking place.
"We've got interest from four other regions and we'll make a decision by March or April," said Kermode.
The Tour Finals, for the world's top eight players in the men's game, runs from 9 November at the O2 Arena.
It has been held at the London venue since 2009 and has a contract to remain there until 2015.
Roger Federer, Novak Djokovic and Rafael Nadal have all qualified for the eight-day event, but Andy Murray has yet to secure his place.
You can hear more of Kermode's interview with Jonathan Overend in Sunday's 5 Live Sport from 12:00 BST.