The leu hit a record low against the euro in 2012 during a political crisis, when a government attempt to impeach the president raised doubts over policy and the country's International Monetary Fund deal. It has regained some ground since a December election eased some of those worries.

"The improved perception of investors towards Romania helped us on many levels but ... with such a sudden change in sentiment it would be a problem if it were reversed just as fast," Isarescu told reporters.