The FIA looks set to rule on whether or not Mercedes broke F1 regulations in undertaking a tyre test with Pirelli following the Spanish Grand Prix.

Red Bull and Ferrari both lodged a protest against the Brackley-based team prior to the Monaco Grand Prix after it emerged that Mercedes had taken part in a test with Pirelli at Catalunya following the first race of the European season.

Mercedes insists that it asked the FIA for permission to run its 2013 car in the test, with Pirelli having requested the opportunity to run a current car for development purposes as it seeks to resolve some of the issues it has faced so far this year.

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Stewards in Monte Carlo spoke at length with those involved following the Monaco race, with discussions going on for more than three hours after the chequered flag had fallen.

A statement issued by the stewards confirmed that they would now produce a report for the FIA after hearing from the parties involved, with the possibility that it could go before the FIA's International Tribunal for further discussion.

"The Stewards of the Monaco Grand Prix received protests from Infiniti Red Bull Racing and Scuderia Ferrari concerning an alleged breach of Article 22.4 h) (Track and Wind Tunnel Testing) of the FIA Formula One Sporting regulations by Mercedes AMG Petronas F1 Team," the statement read.

"The stewards summoned representatives of the protesting teams, Mercedes AMG Petronas F1 Team and Pirelli.

"After hearing and collecting information the Stewards will write a report to the FIA who may bring the matter before the International Tribunal."

While the issue has been handed back to the FIA by the stewards, Nico Rosberg's victory in the Monaco race would now seem to be secure after the governing body declared the result of the race as official.

Both Sebastian Vettel and Mark Webber, who joined Rosberg on the podium, had expressed surprise at the news of the secret test but both said they didn't feel it had given the race winner any extra advantage during the race.