McLaren driver Lando Norris will start the Mexico City Grand Prix from the back of the grid, dealing a further blow to the team's chances of staying ahead of Ferrari in an increasingly tense battle for third place in the Constructors' Championship.
Norris will take a grid drop as a result of McLaren changing out components of his Mercedes power unit and exceeding the allocation for the season.
Norris' car has been fitted out with a new Internal Combustion Engine, as well as a new Turbocharger and a new MGU-H. Norris moves onto his fourth of each component, meaning he'll be starting from the back of the field.
Alpine's Esteban Ocon has also moved onto a new Renault power unit, taking all new components. As a result, he'll also be starting from the very back of the grid.
Separately, George Russell has been given a new gearbox after Williams confirmed the issues he suffered in Friday's second practice session were on his race unit. As he hadn't completed the required six consecutive events for a fresh gearbox, he will serve a grid penalty.
Video: The secrets of the Autodromo Hermanos Rodriguez circuit
Follow Rudy van Buren as he takes you on a flying lap around the Autodromo Hermanos Rodriguez, home of the F1 Mexican Grand Prix.