Monisha Kaltenborn says Sauber is not frustrated with the Ferrari power unit despite the obvious deficit to Mercedes.

Red Bull team principal Christian Horner has been vocal in his criticism of Renault as Mercedes-powered cars dominated the Austrian Grand Prix, with Fernando Alonso's Ferrari the first non-Mercedes car in fifth place and one of only three within a lap of race winner Nico Rosberg. While Sauber has been uncompetitive so far this year and is yet to score a point, Kaltenborn told that the power unit shortfall was not the source of any tension.

"We have a good relationship that still is good," Kaltenborn said. "We have been through enough, through good times and through bad times. Yes, at the moment there is a power unit out there which gives the customers who have it a benefit and it is a very powertrain dominated season this year.

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"So we don't have that advantage but I know and I am very confident about the fact that they are trying to improve what they can and we have seen that already. So those steps are coming in, but for us it brings us back to the package; everything has to be right so we need to step up everywhere."

With Kaltenborn admitting that Sauber is struggling in numerous areas, the team principal admits the mid-season break after a busy July could help the team.

"I do hope that we can see a little bit of progress in July, but maybe we can try to take [the break] as a step and say 'now we go again'. But we have to keep in mind - which is a bit different from last year to this year of course - that the amount you always invest in to one season you maybe lose out on the other.

"Here, the advantages compared to last year and this year is that there is not that kind of a rule change coming up. So what we are doing now is hopefully to the benefit of next year's car as well."