Attendance at the Valencia port street circuit was notably down on Friday, raising speculation the European grand prix venue might be axed from the formula one calendar.
"Ticket sales have been so poor that there are rumours this may be the marina circuit's swansong after just two years," said a report in the British newspaper Daily Telegraph.
In mid 2007, Bernie Ecclestone signed a seven year contract with Valencia organisers Valmor Sports, which kicked off with the inaugural event in 2008.
There was some criticism of the venue when it held its inaugural grand prix last August, including by spectators whose view was impeded and others who bemoaned a lack of atmosphere.
Renault boss and FOTA's sporting chief Flavio Briatore said the problem hinted at a more fundamental issue for the sport.
"We have fifty per cent of the tickets sold here because there is no energy at the moment," the Italian told reporters on Friday. "We need to establish energy and the appeal of formula one."
