Raoul Hyman and Marcos Siebert will test with Campos Racing during the first GP3 pre-season test at Circuito do Estoril this week.
The two drivers will join previously signed race driver Julien Falchero as part of its three-driver team for the first two days of testing at the Portuguese track on March 22-23.
Hyman returns to the paddock after taking part in post-season testing in Abu Dhabi last year, testing with DAMS and Koiranen GP. He finished in the top-10 on the timesheets in both of the afternoon sessions in the opening two days.
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The South African has had previous experience of racing in European Formula 3 in the 2015 and 2016 seasons.
Meanwhile, Siebert also continues working in the paddock after competing in testing for Jenzer Motorsport and Trident last winter. He finished with a best result of 11th place in the timesheets on the second day of tests at the Yas Marina Circuit.
The Argentinian is currently looking to move forward in his career after winning the Italian F4 championship last year with Jenzer.
Both drivers are currently in discussions with the team over a full-time drive in the series in 2017.
