Red Bull Racing has confirmed junior driver and GP2 Series challenger Pierre Gasly will be on driver duties for both days at the in-season Silverstone test this week, as the rest of the F1 teams' driver line-ups take shape.
As expected the Milton Keynes-based squad has given its reserve driver a run in the RB12 for both Tuesday and Wednesday at Silverstone after the French driver claimed a maiden GP2 race win at the British circuit at the weekend.
Gasly drove for Toro Rosso in the first in-season F1 test at Circuit de Catalunya after the Spanish Grand Prix in May.
Elsewhere, Williams have confirmed Valtteri Bottas and development driver Alex Lynn will spend a day each running the FW38 in the second in-season F1 test.
Mercedes hands Renault's reserve driver Esteban Ocon and Manor's Pascal Wehrlein a day each in the 2014 car as the German manufacturer shifts its focus on to early 2017 preparations.
At Ferrari, academy driver and GP3 Series leader Charles Leclerc will be back in action having enjoyed an FP1 outing with Haas on Friday at Silverstone. Leclerc will share his time in the Ferrari with regular driver Kimi Raikkonen.
Leclerc is one of nine drivers not currently on the F1 grid lined up for the test, with in-season testing rules stating teams must give two days of track action to inexperienced drivers (competed in two Grand Prix or fewer).
Silverstone in-season test driver line-up:
Esteban Ocon and Pascal Wehrlein (2014 car)
Charles Leclerc and Kimi Raikkonen
Valtteri Bottas and Alex Lynn
Carlos Sainz Jr and Sergio Sette Camara
Fernando Alonso and Stoffel Vandoorne
Sergey Sirotkin and Jolyon Palmer
Rio Haryanto and Jordan King
Sauber not participating