Countries in the European Union are unlikely to consider an exit from the bloc once they realize how complicated, costly and disruptive the process will be for the United Kingdom, the secretary general of the Organization for Economic Cooperation and Development (OECD) told CNBC on Saturday.
"Nobody in their right mind will even attempt or even think of leaving the European Union because they will understand that it is not in their best interest," Angel Gurria told CNBC before the start of the G-20 finance ministers and central bank governors meeting in Chengdu, China.
Gurria had recommended against the Brexit vote, but says the next step should be helping the U.K. and its partners through the proceedings in the least costly and least disruptive way.
On the Italian banking crisis and whether the EU should rescue the country's third largest bank, Monte dei Paschi di Siena, Gurria said that "national, regional and EU intervention is necessary".
However, the challenge is to define who is going to be doing what, he added.
Rome is bracing for the results of critical bank stress tests that are due on July 29 and is hoping to find a solution for the battered bank ahead of that.