Robert Kubica insists he does not regret returning to Formula 1.

That is despite the fact that, just five races into his first season since sustaining permanent arm injuries in 2011, rumours of Kubica's demise are now beginning.

Sergey Sirotkin said he would gladly take his Williams cockpit back, and new team reserve Nicholas Latifi impressed the team with his Barcelona test.

Kubica admits that 2019 hasn't gone his way.

"The season isn't over yet, we've only just had the fifth grand prix," he told the Polish business newspaper Puls Biznesu.

"Unfortunately, in this difficult situation, we often forget - and even I forget as well - about what I managed to achieve.

"Of course everyone including myself would like us to have better results," Kubica added. "That would make things easier for me.

"But as I have said, it is much better to be here than to be watching the races on television."

Kubica, 34, says Formula 1 has changed a lot since he last raced some eight years ago.

"Everything except the steering wheel has changed, although that has changed as well," he said. "The races have changed as well. Everything is completely different."