Pirelli's Director of Motorsport Paul Hembery has said there will be no more alterations to the Pirelli tyres after the upcoming changes are tested in Montreal and possibly introduced at Silverstone.

There was strong criticism of Pirelli after the Spanish Grand Prix when a four-stop-strategy was needed despite heavy tyre conservation by the drivers throughout the race.

Pirelli reacted saying it would move to reduce the amount of degradation and pit-stops needed by bringing new tyres to this weekend's Canadian Grand Prix in Montreal. However, the move was blocked by the FIA as such changes are against the regulations.

Instead drivers will test a slightly revised rear tyre in Montreal hopefully ending the tread failures seen in Bahrain and Spain and providing all teams agree those tyres will be introduced at the following race in Great Britain.

Looking beyond the potential upcoming changes Hembery said the need for unanimous agreement from all teams made the possibility of further changes during the year very unlikely.

"Ideally we'd like to change the harder compound to give us more guarantees of being under three stops," he is quoted by PA Sport news agency.

"But that sort of change needs the agreement of all 11 teams. Teams have taken different design approaches, so some feel they don't wish to be penalised by an in-season change that may alter their performance levels," he added.

In other Pirelli news the Italian tyre supplier and Mercedes have been summoned to the International Tribunal court by the FIA over a secret test that took place between the Spanish and Monaco GP's.

Earlier Ferrari's test with Pirelli had also been included in the FIA's investigation however it is now understood that test has been dropped from the governing body's probe.

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