Austin: Ferrari drivers Sebastian Vettel and Kimi Raikkonen will have to bear 10-place grid penalties for Sunday's Formula 1 United States Grand Prix after their team decided to use an updated power unit.

Reportedly, it has always been Ferrari's plan to have a new engine for the USGP as it would allow the Italian car makers to have fresh engines for the remaining four races. It would also give them an opportunity to work on developing its 2016 power unit.