Sauber CEO Monisha Kaltenborn has said the Swiss-based outfit is under 'no pressure' to make a decision about its driver line-up for next season.

Sergio Perez has been mooted as a possible candidate to replace Felipe Massa at Ferrari in 2013 and earlier this week the Mexican said he had proven he has the speed to deliver [see separate story - HERE]. Despite all the speculation though, Kaltenborn added that there is no chance anything will change before the end of this year, even if that was one of the rumours doing the rounds back in March, after Perez almost won in Malaysia.

"We make our driver line-up for a whole season, so from that point of view there will be no changes," she told the official F1 site, when asked how long she thinks they can keep Perez before he is lured away by one of the bigger teams. "We are not worried.

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"And we are in the middle of a season that hopefully will be a successful one for us - at least all indications point in that direction - and our drivers have to focus solely on this season. Regarding the future, we are not under pressure and I am laid back about it."

Meanwhile she added that the performances of Perez and team-mate Kamui Kobayashi have both been good.

"I would put on record that both show a good development curve. Never forget Kamui is in only his third season, and Sergio only his second. They have established a good communication line to their engineers and to the whole team, and are always very welcome in the factory as their input is held in high regard," she continued.

"Actually, my impression is that both like to come to Hinwil - to get a better picture of the 'birthplace' of their cars.

"That is really welcomed by the engineers as they can see that they want to be close to every development step that is made.

"I also think that both are behaving well. Of course tempers can sometimes run a little wild, but that's because they are young. So the interim report reads 'satisfactory'."