"We are ready to join when you have resolved your problems and when we can say to our people 'we can now safely join'," Radoslaw Sikorski told the Frankfurter Allgemeine Zeitung.

"You can hardly blame us for not wanting to enter while the eurozone is in a grave crisis," he added.

Poland, which joined the European Union in 2004, has said it will meet Maastricht Treaty criteria for eurozone entry by 2015 but has refused to peg a date for abandoning the zloty because of the debt crisis.