Robert Kubica has said that his first day of running in Abu Dhabi has given him the confidence that "things can work out pretty well" for him in Formula 1 again.
Kubica was appearing in Williams colours for the first time as he looks to seal a return to Formula 1 alongside Lance Stroll for the 2018 season.
The Pole was ninth quickest at the Yas Marina circuit and completed 100 laps in the process. He will return to the car on Wednesday for a final two-hour stint in the last track action he will see before Williams announce their line-up.
"First of all I have to be sure that I am able to do it and for sure every day — and a day like today — is giving me quite a lot of confidence that things can work out pretty well," Kubica told reporters after his day of testing at Abu Dhabi.
"For my standards pretty well means it has to be a high level. If I'm coming back I'm not just here to do a number.
"Although I've been away for seven years and with my limitations I have to be sure that I am able to provide my best possibilities, the best Robert Kubica which I know.
"In the end what the future will bring I don't know, but definitively if you look at the overall picture, where I was 12 months ago and where I am now, it has been a good 12 months.
"For sure today was the kind of day that if nothing more happens, there will be some disappointment, because I feel very confident and very comfortable, but also if you think where I was, I can only be happy and a bit proud of what I achieved in the last ten months."