It appears Toro Rosso made a mistake when it confirmed Pierre Gasly would be driving alongside the returning Daniil Kvyat at the U.S. Grand Prix as it still remains uncertain he will be allowed to do so.
On Saturday evening, several hours after qualifying, Renault announced it had reached a mutual agreement with Jolyon Palmer to walk away from his deal, allowing Carlos Sainz to join for the final four races ahead of a full switch in 2018. That announcement was then followed by one from Toro Rosso, saying Daniil Kvyat would return to the cockpit in Austin alongside the man who has replaced him at the last two races, Pierre Gasly.