Kubica says "90 percent" of his driving is the same as before

The Pole has undergone an intensive physical training regime and had tests with Renault and Williams in a bid to return to F1 next season.

Kubica insists he is not driving one-handed and is in better physical shape than when he was last racing in F1 back in 2010.

The Pole has undergone an intensive physical training regime and had tests with Renault and Williams in a bid to return to F1 next season.

Kubica insists he is not driving one-handed and is in better physical shape than when he was last racing in F1 back in 2010.

"I'm in better shape fitness wise than I was in the past. Now I have to work much harder - age doesn't help.

"The big difference is the brain. It's incredible how big potential the brain has and how quickly it can adapt to different conditions.

"Unfortunately I was interrupted in my career. I had several injuries.

"In the end, I learned how to live with them, how to drive an F1 car with them and in the end I'm quite surprised by the results I saw."

Kubica faces competition for the seat alongside Lance Stroll from Sergey Sirotkin, Daniil Kvyat and Paul di Resta.

The Pole had been favourite for the seat, but his results from testing, when Sirotkin also ran in the car, have made it a closer race.

Williams will analyse data gathered from Kubica and Sirotkin's running at the Abu Dhabi test and hopes to make a decision in the coming weeks.