French President Emmanuel Macron said that the possibility of change to EU treaties was "not taboo" and that he wanted to see better protection for Europe's workers.
He was speaking in Berlin on his first foreign visit since his inauguration yesterday, and at his first joint news conference with German Chancellor Angela Merkel.
Mr Macron dispelled the idea circulating in German media that he was in favour of turning national debts of eurozone countries into eurozone debt.
"I am happy that we can work together on a common roadmap for the European Union and the Euro Zone," he said. "In the past, the subject of treaty change was a French taboo. It will no longer be the case."
"There are several areas in which we can cooperate in the short term," he added
"Common asylum policy, posted workers and bilateral trade. All these will have an impact on our citizens. We need more pragmatism, less bureaucracy and a Europe that protects our citizens."
On the subject of debt, he added: "I have never defended (the idea of) Eurobonds or the mutualisation of existing debt in the euro zone.
Chancellor Merkel said she was open to Mr Macron’s proposal to create a level playing field between European Union countries and other international trade partners.
Asked if she was worried that Mr Macron's push for a "Buy European Act" could undermine the established order of free and open trade, Ms Merkel said: "In trade relations, for example, I see this element of reciprocity, this is something I can very well imagine."
She added that the German government had already asked the European Commission to look into the possibility of protecting investments in strategic areas on a European level and not only through national regulation.
A source close to Mr Macron had said before the meeting he would seek to convince Ms Merkel to back his "protection agenda" for Europe which includes a "Buy European Act" and regulations to prevent strategic firms from falling into non-European hands.