Just as the US Grand Prix ended its uncertainty, doubts have now emerged about whether this year's Brazil race will take place in November.
Brazilian reports say that F1 supremo Bernie Ecclestone told a media outlet that talks with organisers about solving a financial matter were underway.
The Portuguese-language Grande Premio quotes Interlagos race promoter Tamas Rohonyi as acknowledging Ecclestone's comments.
"When Bernie said that we are working to solve problems, he is referring to the effort to reduce organisational costs," he said.
"An example: there was a study to reduce medical staff costs required by the FIA and it was promptly answered.
He played down claims that Brazil's future on the F1 calendar is now under a cloud.
"Doing a major international event in the current situation is difficult, but not impossible. It will be done according to the contracts in place at least until 2020," said Rohonyi.
"But it is a fact that all the races that are not paid for by governments face difficulties because of the astronomical fees."
The race is pencilled in for November 13.
