Monisha Kaltenborn feels Sauber's commitment in young drivers gives her team reasons to be optimistic ahead of the 2015 F1 season.

Sauber has had a complete shake-up of its driver line-up, dropping Esteban Gutierrez and Adrian Sutil and replacing them with 22-year old Felipe Nasr and 24-year old Marcus Ericsson, while Raffaele Marciello is in place as the team's third driver while competing in the GP2 Series.

"I am delighted about our two new drivers, who bring a breath of fresh air," Kaltenborn said. "They are young, talented and highly motivated. On their way to F1, both stood out through victories in Formula BMW and F3. Both then finished this career progression off in the GP2 Series.

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"While Marcus looks back to one season in F1, Felipe will have his rookie year in which he comes fully prepared due to his role as test and reserve driver at Williams last year. I feel confident with regard to our drivers."

Sauber released its new F1 car, the C34, on Friday with an all-new livery of blue and yellow which means the team will be almost unrecognisable compared to 2014.

The Swiss squad will begin its 2015 season at the first official F1 test at Jerez on Sunday.