Toro Rosso admits it has no idea how it will perform at the second test in Bahrain, saying it "is a complete mystery".

Issues with the Renault power unit restricted Toro Rosso to a total of just 54 laps across the whole of the first test at Jerez, with only Marussia - which arrived late - and Red Bull completing less mileage. Following such an inauspicious start, Toro Rosso said it is unsure how it will perform when testing resumes in Bahrain next week.

"How do we expect to get on at the tests? Clearly, after the first four days in Jerez, that is a complete mystery," the team wrote on its website. "Suffice to say that everyone in Faenza, Bicester and Viry, the latter being home to our Power Unit supplier, has been working flat out."

Toro Rosso also revealed its driver line-up for the opening test at Sakhir, with the drivers running on alternate days.

"For the first of the two tests in the desert, Daniil Kvyat will drive on the first and third days, with Jean-Eric Vergne at the wheel for days two and four."


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