Robert Kubica feels he’s proven he’s capable of a Formula 1 comeback in 2018 as he awaits a decision from Williams.

The Polish driver completed 128 laps in total for Williams during the two-day Abu Dhabi tyre test last week in the team’s FW40 while setting the fastest outright lap by the team with a 1m 39.85s – quicker than Lance Stroll and Sergey Sirotkin.

While Williams remained tight-lipped on reaction to Kubica’s performance in the post-season test sources close to the team confirmed signs are positive while also being impressed by Sirotkin.

Kubica says he’s awaiting a decision from Williams but is confident he did enough to prove to Williams he’s ready for a full-time F1 return after a severed right forearm suffered in a rallying crash forced him away from the sport in early 2011.

“Six months ago it was about ‘let’s try and see’ and if it went well we could forward and if it went wrong at least I tried,” Kubica told BBC Sport. “Now things have moved forward and everyone knows the situation so let’s wait and see for the final decision.

“I have never been ready 100% even when I was racing in my gold times. I think I’ve done a lot and I’ve proven myself. There are a lot of things that give me confidence and positive answers but the decision is not on myself.

“I cannot be 100% sure because no one can be 100% sure but I can have confidence. I was looking to get a feeling and a belief that I can do it. That’s the most important thing.

“The situation is not easy with my limitations but I think there were a lot of questions about my limitations and my fitness and I think I’ve shown although I have limitations fitness-wise I’m ready and have never been in such a good shape as I am now.”