Race drivers Jean-Eric Vergne and Daniil Kvyat will test for Toro Rosso in Bahrain

Mercedes now the only team yet to confirm line-up

Image: Danill Kvyat and Jean-Eric Vergne will be behind the wheel at Sakhir

Toro Rosso will run both of their 2014 race drivers, Jean-Eric Vergne and newcomer Daniil Kvyat, in the Pirelli tyre test in Bahrain next week.

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