The Faenza team has yet to decide which of its two race drivers will be replaced at each event.

Twenty-year-old Gelael, who currently lies 20th in the F2 championship, has already driven the STR12 in this year's post-race Bahrain and Budapest test sessions.

"During the tests in Bahrain and Budapest Sean performed very well, helping the team in a very professional way, with a mature approach to the complex task of providing engineers with useful feedback," said team boss Franz Tost.

"Everyone within the team was impressed by his performance, his technical understanding and his commitment."

Gelael added: "I will use the opportunity to absorb like a sponge everything I can and learn as much as possible.

"I hope I can do a good job for Scuderia Toro Rosso and provide the team with good data from these important first sessions."