F2 racer Sean Gelael will drive for Toro Rosso in four FP1 sessions over the 2017 run-in, the team have announced.
Gelael, 20, will be on duty in Singapore, Malaysia, the USA and Mexico - none of which clash with his current efforts competing in F2. The Indonesian already has previous experience with Toro Rosso, having tested for them earlier this year in both Bahrain and Hungary.
Team principal Franz Tost said those tests had helped convince of Gelael's abilities, "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.
"Everyone within the team was impressed by his performance, his technical understanding and his commitment. Therefore, we are happy that he will be driving the FP1 sessions for us at these four Grands Prix.