Monisha Kaltenborn has said that she's happy that Sauber F1's future has been secured by an investment deal with three Russian companies reportedly bringing funding of the order of $305 million to the Swiss-based team.

"The very first thing that has already taken place now that we have our contracts in place is that we were very happy and relieved," the team principal told reporters in Budapest ahead of this weekend's Hungarian Grand Prix.

And Kaltenborn went on to dismiss paddock speculation that the deal was not yet sealed and could still fall apart at the last minute. "I certainly have no reasons to believe that," she replied. "We know what we are talking about and we have good reasons to believe in it."

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However, Kaltenborn was quick to play down reports that the team's very survival had been dependent on the deal going through.

"It wouldn't be right for us to think in the way that 'If we don't get this deal done we cannot survive or not'", she said. "It's just a question of do you want to survive or do you really want to stay here and hopefully again at some point in time - the sooner the better - make the step ahead.

"We're in here, we've gone through tough times before and we know that we can survive," she added.

What the deal does mean is that Sauber can now once again start making long term plans to improve their competitiveness in the world championship - which include integrating their new partners into the racing operation.

"We are now focusing on starting the implementation of this co-operation because it's a very complex and comprehensive deal," she said. "The major part of it is focusing on technology and we know from our previous experience which we had with Petronas in the past that you really have to go in to a lot of detail and you have to set out long-term plans because this is something that is a long-term co-operation.

"That was our focus and we knew that if this deal comes through in this way we have that basis on the long term to really make our way up again. That's what is going to happen now, step-by-step," she continued. "That's what we're doing right now."

There have been rumours that the new investors will want to bring in their own people into key aspects of the F1 operation, with the engineering staff expected to be significantly overhauled.

Also under speculation is Kaltenborn's own position under the new ownership. Although the 42-year old - who became F1's first female team principal when appointed to the role in January 2010 - had previously been reported to hold a 33.3 per cent stake in the team, it's unclear where the influx of investors will leave her in the management structure moving forward.

Sauber's lead driver Nico H?lkenberg had this week been forced to deny rumours that he's about to walk away from the team over the summer break in August, after reportedly not having been paid by the cash-strapped team in recent weeks. H?lkenberg's not alone in that predicament, with Lotus F1 also reportedly struggling to pay star driver Kimi Raikkonen in recent times.

In any case, H?lkenberg's position for 2014 looks at risk after reports that 17-year-old Russian driver Sergey Sirotkin is being lined up for a rapid elevation to a race seat; Sirotkin's father Oleg is Director General of the National Institute of Aviation Technologies, one of the group of Russian investors behind the Sauber bail-out.