Jean-Eric Vergne and Daniil Kvyat will represent Toro Rosso at next week's tyre test in Bahrain.
Red Bull, Ferrari, Toro Rosso and Mercedes will be the only teams in action at the Sakhir circuit from December 17-19 following McLaren and Force India's decision to withdraw.
However, while the likes of Red Bull and Ferrari have opted against using the likes of Fernando Alonso, Kimi Raikkonen and Sebastian Vettel for the Pirelli test, STR will have Frenchman Vergne and Russian rookie Kvyat behind the cockpit of their 2013 car.
Red Bull: Sebastien Buemi
Ferrari: Pedro de la Rosa and Jules Bianchi
Toro Rosso: Jean-Eric Vergne and Daniil Kvyat