The future of the struggling US Grand Prix was thrown into further doubt on Wednesday when the 2016 Formula One calendar listed the race as "subject to agreement" with the promoter.
Officials at the Circuit of the Americas have said they are financially strapped after storms wiped out much of the 2015 race weekend and by news the Texas governor's office is cutting public funding by nearly 20 per cent.
The 2016 race calendar still has the race scheduled for October 23 but with an asterisk.
Track officials did not immediately respond to a request for comment.
The track was built to host the race, which has run in Austin since 2012.
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Mercedes driver Lewis Hamilton has won three times, including this year to clinch this third Formula One championship.
