Sergio Perez has been excluded from today's GP2 Series race in Istanbul after a post-race inspection revealed his car to be underweight.
The Barwa Addax driver will now start tomorrow's sprint race from the rear of the grid, with his team-mate Giedo van der Garde inheriting the Mexican's fourth place.
Perez's exclusion also means that Dani Clos has been promoted into eighth and will start the sprint race from pole alongside Christian Vietoris for an all-Racing Engineering front row.