Sauber has elected to change Sergio Perez's gearbox before the Monaco Grand Prix, meaning the Mexican will move back one place to 24th on the grid.
Perez had initially been last after qualifying as he had crashed at the first part of the Swimming Pool in Q1, suspecting a car problem related to a collision with Pastor Maldonado in final practice.
Maldonado was then given penalties both for that clash and a gearbox change, meaning he moved right back to 24th and Perez was elevated to 23rd. But they will now change places again following Sauber's decision to give Perez a fresh gearbox as well.