Authorities and organisers of the Kuala Lumpur Grand Prix are considering halting the race after the contract ends in 2018.
The 2019 Formula One world championship starts on March 17 with 21 races in a season that ends later than any since 1963.
Sebastian Vettel's hopes of vaulting back into the overall Formula One world championship lead were wrecked by a first corner collision on the opening lap of the Singapore Grand Prix.
Sebastian Vettel justified his favourite tag for the Singapore Grand Prix when he stormed clear of his rivals in Friday's second free practice, lapping more than half a second quicker than Red Bull team mate Mark Webber.
Singapore will be counting on its marquee Formula One race to help make up for a 30 percent drop in Chinese tourists this year.