Formula One debutants USF1 and Campos are asking for five million dollars in sponsorship money to secure a race seat, according to Dutch driver Robert Doornbos.

The former Red Bull and Minardi driver currently lines up in the Indy Car series, but has revealed he was recently in discussions to rejoin F1, but could not produce the money necessary to do so.

“There are a number of possibilities we looked at,” Doornbos told NUsport.

“There were conversations with USF1 and Campos Meta were also interested, but they asked for five million dollars in sponsorship money.

“If I had that already I would rather be at the front in Indy Car then at the back in Formula One,” he added.

USF1 are yet to announce either of their drivers, while Campos have only confirmed that Bruno Senna will fill one of their seats.