The EU monetary chief says Ireland's debt crisis is all about its troubled banks -- and that the euro currency is not in danger. Olli Rehn says Ireland's troubles were caused by 'very serious problems in the banking sector.' Rehn said the EU, together with the European Central Bank and the International Monetary Fund, are working on the problem. He expects the 16 countries that use the euro to suppport those efforts at a key meeting in Brussels later Tuesday. Ministers will have to tackle how to stop a sell-off in Irish bonds that has threatened to engulf other vulnerable countries such as Portugal and Spain. He says that the Irish crisis 'is not a matter of the survival of the euro. This is a very serious problem in the banking sector of Ireland.' 