Paul di Resta will take part in his first Formula One Grand Prix for four years after being drafted in at Williams to replace an unwell Felipe Massa.
The Brazilian had reported feeling dizzy after FP2 on Friday, and was taken to the medical centre and then local hospital for precautionary checks. He was then examined by the FIA medical delegate on Saturday morning, who passed him fit to compete in FP3.
During the session however Massa's symptoms returned, prompting the Brazilian to call an early halt to his running.
With regulations requiring any stand-in to take part in at least one practice session before being able to compete in a Grand Prix, Williams have elected to call on their reserve driver Di Resta to replace Massa for qualifying - which counts as a practice session - and the race at the Hungaroring.
The Scot, a veteran of 58 Grands Prix, last competed in F1 69 races ago at the 2013 Brazilian Grand Prix, finishing 11th for Force India. He has remained active since however, twinning his Williams reserve role (which he's held since 2016) with racing duties for Mercedes in the German DTM touring car series. He currently sits 12th in that championship with one victory to his name this year.