The World Motor Sport Council has formally confirmed Pirelli can use 25 days to test 2017 specification tyres ahead of next year's incoming technical regulation revamp.

Anticipated following the acceptance of the proposal - submitted by Pirelli - by the F1 Commission earlier in the week, the available test days rise from an originally agreed 12 to 25 days. This applies to 2016, 2017 and 2018.

The Italian firm had expressed concern it was not being given an ample opportunity to develop and test the tyres it plans to use in 2017 in relation to the proposed regulation changes, which in turn are expected to be signed off later this month.

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Now the WMSC has confirmed current cars fitted with 2017 tyre sizes are permitted, while there is an opportunity to test 2017 tyres on 2013 and 2014 cars.

"The World Motor Sport Council today approved changes to Articles 10.2 and 10.6 of the Formula One Sporting Regulations in order to provide the appointed tyre supplier additional opportunities to undertake testing in preparation for the 2017 season.

"The further testing was deemed to be essential for the purpose of developing the new tyre sizes permitted by the 2017 F1 Technical Regulations.

"The changes will allow 25 car days of testing with current cars, fitted with 2017 tyre sizes, in 2016, 2017 and 2018.

"In addition, there will be an opportunity to test prototype 2017 tyres (in 2016 sizes) on 2013 or 2014 cars - these tests on older cars only apply in 2016."

Pirelli had threatened to quit as F1's control tyre supplier if its proposal was not accepted, arguing that with much of the expected lap time improvement next year set to come from new tyres - running in a different size to the current rubber - it needed more opportunity to track test them ahead of 2017.