Ferrari has been told by the FIA that it cannot continue to run with a new design of rear wing, after the governing body deemed it to be in breach of the technical regulations.
The Scuderia's cars featured a higher than normal flap extension on their rear wings in Friday practice in Spain, which the FIA had been looking at closely to work out whether it should be allowed under the rules. Although the wing was theoretically too high, Ferrari had tried to exploit an area in the rules relating to slot-gap separators, which are not taken into consideration when measuring the wings.
FIA technical delegate Charlie Whiting had said in Spain on Friday: "It's a very clever interpretation of the rules and we have got to decide whether it's a good interpretation of the rules."
The FIA's decision means that Ferrari has had to take the new wing design off its car for the final free practice session in Spain, and it has reverted to the specification of rear wing that it used at the Turkish Grand Prix.