The Chairman of the Board of Directors of Eurobank Ergasias has insisted the UK will soon realise it has made a mistake by voting to leave the EU.
Mr Karamouzis said it would be “ignorant” to think European member states would be better off without the European Union.
Speaking at a conference, he said: “I personally believe the UK decision to leave the European Union is not a step in the right direction.
“But in democratic societies, we have to fully respect the decision of the British people to democratically determine their own destiny.
Nikolaos Karamouzis said Britain may soon realise it made a mistake to vote to leave the EU
“The rest of Europe, despite the current uncertainties, setbacks and differences, is the best time to work together and continue our efforts towards closer European declaration and more Europe not less Europe.
“Only someone ignorant of history could believe Europe could be more prosperous, stable, influential, secure, democratic and liberal place if it was to separate into 28 pieces.
“In time the UK might slowly and painfully come to realise that it has not become richer, more united or more influential outside the European Union.”
The bank chief admitted Europe would also be losing out from Britain deciding to leave the bloc.
The UK might slowly and painfully come to realise that it has not become richer
He added: “Europe is also losing too from UK departure. Europe is losing a net contributor to Europe’s budget.
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“It is a member state that is highly influential in world affairs and has a long history of global diplomacy.”
The comments from Mr Karamouzis come as Donald Tusk has taken over firmer stance over his negotiation plan when discussing Britain leaving the EU.
Members are thought to have rejected the idea a trade deal can be discussed simultaneously alongside the Brexit divorce bill, which is thought to be in the region on £50billion.
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The debate in the European Parliament in Strasbourg will focus on key issues of the Brexit talks including reciprocal rights for EU citizens, the peace process in Northern Ireland and trade
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Nigel Farage gestures during speeches at the European Parliament in Strasbourg, eastern France
The bank chief reiterated that the two-year Brexit process would be difficult but urged both EU and UK leaders to work hard towards an agreement.
Mr Karamouzis finished: “The negotiation between the European Union and the UK will be prolonged, long and difficult.
“The talks will touch every aspect of the relationship. But specifically they have to address the issue of this untangling budget obligations – including money owned by the UK.
“We would like to hope the European Union and UK come to a smooth agreement, especially a transitional agreement without hostility or confrontation.”