Brendon Hartley
On 26 September 2017, it was announced that Pierre Gasly would replace Kvyat for an unspecified number of races, beginning with the . At the , Sainz moved to Renault for the remaining rounds of the season, ahead of his previously announced move for , with Kvyat returning to the team. Gasly was absent in order to participate in the final round of the Japanese Super Formula Championship, so Brendon Hartley replaced him for this race. After the race, it was announced that Gasly would return to partner Hartley for the . After the 2017 Mexican Grand Prix, Helmut Marko said that Daniil Kvyat would not be returning to Toro Rosso and that the team would race with Brendon Hartley and Pierre Gasly for the remainder of the season.