Robert Kubica: I can't wait long for Williams 2019 F1 race seat

Kubica came close to securing an F1 racing return with the team this season, before missing out to Sergey Sirotkin and taking a reserve role.

Deputy team principal Claire Williams has made it clear Kubica is on the shortlist for 2019, evening suggesting on Thursday that he would be a "fantastic" team-mate for Williams's incoming rookie George Russell.

Although encouraged by her comments, Kubica insists that he does not want to miss out on other opportunities by holding out for the Williams race seat.

"If she said this, maybe it's correct," Kubica told Sky Sports F1.

"Time will show. Time is running, I don't want to wait as it was last year.

"Hopefully there will be some decisions earlier than it was [for 2018].

"Of course the target will be to be on the grid next year, but as I said, I cannot wait until December. The situation is quite clear, and we will see.

"I think the team is evaluating different scenarios, and they are right to do it. And I'm doing on my side some other stuff.

"So we'll see if there will be a common agreement or not.

"But as I said I'm focused on, let's say, seeing other opportunities, because I don't want to find out myself in December or whenever it will be that it's too late and have nothing."

Kubica stressed that he wants to race in another category if the Williams opportunity does not work out for him.

"The aim is to be on the grid in F1, it will be let's say the priority," he added.

"If this doesn't happen I might be still in the paddock, in F1, of course not racing in this case.

"Or maybe some other series as a driver. We will have to wait and see.

"I think in the next couple of weeks it should be decided, at least from my side."