The FIA has amended the 2013 calendar to open up a race slot "for another F1 European event" next season.

The German Grand Prix has been brought forward one week from its original date of July 14 to July 7 in order to allow the date of July 21 to be reserved. While reports had suggested that a one-off French Grand Prix would be held in 2013, it appears that the most likely addition will be the return of the Turkish Grand Prix at Istanbul Park after the circuit came under new ownership.

The change was announced following the final 2012 meeting of the World Motor Sport Council (WMSC) in Istanbul today, with the FIA stating: 'The date for the 2013 Grand Prix of Germany has been moved to 7 July, and 21 July has been reserved for another F1 European event, subject to the approval of the relevant ASNs.'

At the same time it was announced that the 'force majeure' allowance has been deleted from the 2013 Technical Regulations when a car stops on track in qualifying and that 'the FIA will determine how much fuel the car would have used to get back to the pits and add it to the one litre sample minimum.'

Teams will also face more stringent front wing deflection tests next season, while the team personnel curfew on a Thursday night has been extended from six to eight hours, but the number of times a team can break the curfew without penalty reduced from four to two.