Doubts over the euro emerged following the "no" votes over the constitution.
"we will not listen to such a silly suggestion."
Luxembourg's prime minister is dismissing any possibility that individual countries might abandon the euro after Italian ministers called for a return to the lira.
On the second day of EU finance ministers' talks in Luxembourg, Jean-Claude Juncker said it's inconceivable that a country could dropout of the euro.
"What I want to tell you here is that we will not listen to such a silly suggestion."
Doubts over the euro have emerged following the "no" votes in referendums over the European constitution in France and the Netherlands and Britain's decision to postpone the referendum.
Some Italian government ministers have publicly called for a return of the lira. They are criticising the European Central Bank's one-size-fits-all interest rate policy and blaming the euro for higher prices.