The FIA has confirmed a return of in-season testing for the 2014 F1 season as part of a number of revisions to the Sporting Regulations for next year.

Four tests, each of two days in length, will take place in the week following European events on the schedule, with the decision being taken to run the tests on the back of Grand Prix weekends to help keep costs down.

While the governing body failed to mention which circuits would host tests, Pirelli's Paul Hembery revealed during the BBC's coverage of second free practice for the British Grand Prix that the tests were set to follow the races in Spain, Britain, Hungary and Italy.

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However, those tests can only be confirmed once the 2014 schedule has been finalised.

"Four two-day track tests will be allowed in season in place of the current eight one-day promotional days and the three-day young driver test," the governing body said following the latest meeting of the World Motor Sport Council. "These will take place at tracks in Europe on the Tuesday and Wednesday after a race in order to ensure minimal additional resources are necessary."

With new engine regulations coming into force next year, with the introduction of 1.6-litre turbo-charged engines, the FIA also confirmed that the current regulation stating that teams are unable to run their new cars in January has now been dropped.

As such, teams will be able to start running in the first month of the year to gain early experience of the new engines.

"Track testing will now also be permitted in January 2014 in order to allow earlier testing of the new power units," the missive from the FIA added.