Crucially, Kubica was able to pass the mandatory FIA extraction test, which requires drivers to extricate themselves from the cockpit of an F1 car, while wearing full race suit and helmet and seat-belted in, within 10 seconds.

There had been concerns that the limited movement and lack of strength in Kubica's right arm, the consequence of a rally crash that ended his F1 career in 2011, would make it impossible to pass the extraction test – notwithstanding the fact that he had recently run competitive laps in an old-spec Renault F1 car.

All eyes will be on the polish driver during the Hungary sessions as gets behind the wheel of the Renault and attempts to show that he is ready for what would be a remarkable F1 comeback.

It is expected that there will be a vacant seat at Renault next year with the likely departure of current driver Jolyon Palmer.

Fernando Alonso has been linked with a move from McLaren to Renault for 2018 but the financial sum involved is said to be one sticking point. Renault has other options, including current Toro Rosso driver Carlos Sainz, along with its own test drivers – and potentially Kubica.