The euro has fallen by more than 1% against the dollar, following a report that Greece had raised the possibility of leaving the single currency.
German magazine Der Spiegel said eurozone finance ministers were holding a crisis meeting in Luxembourg.
The report has been denied vigorously by eurozone countries, including Greece and Germany.
However, the BBC has learned that ministers from four eurozone countries are indeed meeting in Luxembourg.
The countries - France, Germany, Finland and Netherlands - are said to be discussing EU issues, including the financial situation of Portugal, Ireland and Greece.
"The report about Greece leaving the eurozone is untrue," the Greek deputy finance minister Filippos Sachinidis told Reuters.
"Such reports undermine Greece and the euro and serve market speculation games."
http://www.bbc.co.uk/news/business-13317770
Note: 6 May 2011 Last updated at 18:45 GMT