Warned the French Central Bank Governor Francois Filori, that financial institutions in London are at risk of losing their privileges to enter the European Union, if Britain left the single market.
Villeroy said that banks in London will lose the "inadmissibility of the financial pass," which allows it to trade freely in the EU.
Said Jeroen Damleom, Finance Minister of the Netherlands, Prime Minister of a group of financial Europe, earlier, that banks may take their business outside of Britain.
But the British economist Gerard Lyons, felt it would be difficult for banks to drain London.
And offer many of the banks, which is based in the London-based, it serves customers throughout the EU without hindrance, according to the rules of "laissez-passer".
But these rules will be threatened if the choice of the single European market Britain to leave as part of its withdrawal from the European Union.
Activists said at a campaign out that London will remain a financial center in Europe, and will be the base of "laissez-passer" part of the negotiations, the trade relations between Britain and the European Union.
The Villeroy, who is also the governing body of the European Central Bank member to quickly start the talks.
"There is a precedent in the Norwegian model of the European Economic Area, and could allow Britain to retain the right of access to the single market, but with the commitment to implement all the EU rules."
"There would be a contradiction of some thing to leave the Union and the application of all rules at the same time, but the only solution if Britain wanted to maintain access to the single market." Aa