"In this union of tomorrow, or of the day after tomorrow, would it be too bold, in the economic field, with a single market and a single central bank, to envisage a ministry of finance of the union?" he said as he accepted the Charlemagne prize for contributions to European unity.

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"Looking at the euro area today, we see clearly that countries that abide by the rules of the single currency can thrive and prosper," Trichet said. "But we also see the opposite. Strengthening the rules to prevent unsound policies is therefore an urgent priority."

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"But if a country is still not delivering, I think all would agree that the second stage has to be different," he said, suggesting that eurozone authorities be given "a much deeper and authoritative say in the formation of the country's economic policies if these go harmfully astray".

He added: "It would be not only possible, but in some cases compulsory, in the second stage for the European authorities - namely the council on the basis of a proposal by the commission, in liaison with the ECB - to take themselves decisions applicable in the economy concerned."