Formula One CEO Bernie Ecclestone has raised doubts over whether the inaugural Grand Prix of America, to be held in New Jersey next year, will go ahead.

British newspaper The Guardian quoted Ecclestone on Tuesday as saying organizers "have not complied with the terms and conditions of the contract which is now gone anyway. They don't have a contract".

Work has begun on the race site and demonstration runs have been held with world champion Sebastian Vettel of Germany test driving the course in June.