Jack Aitken will make his Formula One debut with Williams at this weekend's Sakhir Grand Prix in place of George Russell who will replace Lewis Hamilton at Mercedes.
Aitken, who has raced all year in Formula 2, is Williams' official reserve driver and will replace Russell, who was released by the team to replace Hamilton after the world champion tested positive for COVID-19.
Aitken was Russell's teammate in GP3 in 2017 and is currently 14th in the F2 standings after finishing fifth in the championship last year with three race wins.
He joined Williams at the start of the 2020 season and drove this year's car during Friday practice for the Styrian Grand Prix in July.