Kiwi Brendon Hartley and Toro Rosso teammate Pierre Gasly are likely to take grid penalties at this weekend's Brazilian Grand Prix.
The Renault-powered team suffered multiple engine failures across the Mexican Grand Prix weekend a fortnight ago and will almost certainly need power unit replacements in both cars.
Hartley's situation is more obvious - his car blew up and caught on fire midway through the Mexican Grand Prix so he is certain to attract a grid penalty.
Gasly managed to finish in Mexico but he admitted there was a strong chance he would start off the back of the grid upon arriving in Brazil.
"It is not confirmed yet, but it looks like it," the Frenchman told Motorsport.com.