Monisha Kaltenborn could not guarantee that Sauber will be on the grid next year, amid comments from Bernie Ecclestone that F1 could see eight three-car teams.

Sauber is one of a number of teams which have been struggling financially in recent seasons and currently sits tenth in the constructors' championship having yet to score a point this year. Following Ecclestone's comments, when asked if she could categorically confirm that Sauber will be on the grid in 2015, Kaltenborn replied: "We plan to be on the grid next year.

"As Sauber."

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And Kaltenborn admitted it is "challenging" for the team to try and find the budget to compete in F1 following the change in regulations.

"It's not looking bad. It's tough, and it's going to remain tough for a while because it's not easy for any team today to find sponsorship. The budgets have gone up, although there's not going to be much of a difference from this year to next year as we can benefit from developments we have done this year. But then it's not going to decrease, so it's going to remain challenging."

While unwilling to comment on rumours linking Canadian billionaire Lawrence Stroll with investment in to the team, Kaltenborn did say Sauber is open to a new majority owner.

"We've always said on that in today's Formula One, to be competitive, you need a strong partner. So we are open to that if it is the right partner and the right thing for the team. That's nothing new to us. If you look back we've had majority owners here other than Peter Sauber. We've had Credit Suisse, Red Bull, so it's nothing new for us."