Robert Kubica has voiced his fears for the future of BMW Sauber.

Kubica was forced to look after his own interests when BMW announced in July they would be withdrawing from Formula One at the end of this season.

That culminated in the Pole signing a deal till at least 2010 last week with Renault, replacing the Ferrari-bound Fernando Alonso.

As for the team he will be leaving behind, they have been granted a provisional place on the grid for next season.

However, their presence is dependent on whether one of the current teams falls by the wayside - or if agreement is reached to allow 14 teams to compete.

Given such uncertainty, Kubica is naturally concerned for those who have aided his own career during his three-and-a-half years with the team.

"It is not an easy situation for all the guys who are working with me, and will still work with me at the next two races," said Kubica before this weekend's Brazilian Grand Prix.

"I think they have everything to be part of F1. But they are not on the grid, so I think it is a very delicate moment and delicate time for them.

"It is a difficult situation. I just hope they will be on the grid, because there is a lot of passion there."

Kubica is relieved his own future has been resolved - although given his status within the sport, it was a question of which team he would join rather than whether he would have a job.

"I am very happy to be part of Renault next year and looking forward to the new challenge," he added.

"I think it will be a big challenge - because in the end there are many things going on at Renault, with difficult times in the last few months.

"But I believe we can do a good job for next year and in the future, and try to be part of a kind of 'new' team."

There are still question marks over who will be his team-mate, because it is widely expected Romain Grosjean will not keep the seat he has occupied since Nelson Piquet was released in early August.

Kubica insists he has no influence on who will partner him but he made it clear Renault are looking at other options beyond Grosjean.

"I think there are a few names who are quite experienced that Renault are looking at for next year," he confirmed.

"I will welcome all the drivers whose names I have heard. I think all of them can do a good job.

"I have my personal preferences, but this is only because of private personal relationships.

"But I will not have any influence. I will leave it to the people who are deciding."