The weekend will give Fred the chance to put his expertise in the simulator to the test on the track, having spent the first part of the year hard at work with the team in Brackley.
He is combining this role with his first season with endurance racing in the United States, where he is competing in IMSA with Cadillac.
Fred said: “I am really looking forward to getting my first taste of the W16 in FP1 in Bahrain.
“Being able to put all of my simulator work into practice on the track is a really exciting prospect for me.
“At the start of the year, I set myself the goal of maximising every chance I get behind the wheel of an F1 car in 2025, and that is what I hope to achieve in Bahrain.
“I will be doing everything I can to help the team, George, and Kimi get set for the rest of the weekend.
“I am grateful to Mercedes for once again giving me this opportunity.”