Giedo van der Garde will have his first run in Sauber's C33 when he takes to the Sakhir circuit in Friday practice for the Bahrain GP.
The Dutchman, who joined Sauber from Caterham at the start of the year, will replace Esteban Gutierrez for FP1.
Meanwhile, Russian teenager Sergey Sirotkin will be in action for the team on the first day of the two-day Bahrain test.
The 18-year-old will test the C33 on Tuesday 8 April, racking up the miles in his bid to secure his superlicence.
He will hand the car over to van der Garde for the final day of testing.