A final decision will be reached before end-2016.
Reuters reported that after negotiating Singapore's current Formula One deal, Bernie Ecclestone said in 2012 the hardest thing was explaining to the authorities that "we don't race for free".
Four years on, the F1 boss appears to be frustrated again as he tries to keep one of the most glamorous races on the calendar after the contract expires in 2017, at a time when the city-state is weighing whether the event makes economic sense anymore.
Find out more about the report here.
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