Valtteri Bottas and Gabriel Bortoleto face grid penalties for Sunday's Mexico City Grand Prix.
In what has been a difficult season for former Mercedes driver Bottas with new F1 team Cadillac, the Finn has been handed a new power unit for the race at the Autódromo Hermanos Rodríguez.
Bottas faces a 50-place grid penalty for taking on a new internal combustion engine, turbocharger, MGU-K, energy store, and control electronics.
It means Bottas is guaranteed to start at the back of the 22-car grid.
Bortoleto's Audi, meanwhile, has been fitted with a new control electronics unit, his sixth of the campaign, with only three per season, so incurring a five-place penalty post-qualifying on Saturday.
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