Formula One chief Bernie Eccleston has cast doubt over whether next year's United States Grand Prix in Austin, Texas will take place.
A contract dispute between track owners and Tavo Hellmund's Full Throttle Productions is currently ongoing.
The track owners have said that they will not continue construction until they have received a contract from Hellmund.
However, Ecclestone has confirmed that the contract has been cancelled after he was found to be in breach.
The 81-year-old is now in negotiations with Circuit of The Americas (COTA) who are developing the track.
Asked whether the race was at risk of being cancelled, Ecclestone replied: "Yes, it will be, for sure, 100%."
The last F1 race in America took place in 2007.
