Cyprus's central bank chief has ruled out writing down the country's sovereign debt as part of an international bailout now being negotiated, saying such a move could undermine Europe's currency union, the Associated Press reports Tuesday.

In an interview, Panicos Demetriades told the newsagency that talk of a Cypriot debt writedown--or haircut--similar to that made by neighboring Greece shouldn't even be taking place.

In Greece's case, private sector investors were forced to take losses on their holdings of Greek government bonds, a step that the other 16 euro zone countries insisted would remain a one-off for fear of scaring away investors.

"Haircuts of any kind will not help," Demetriades said. "Discussions undermine the prospect of recovery and threaten the stability of the euro area, not just Cyprus."

In his remarks, Demetriades said Cypriot banks, which are at the center of Cyprus's debt crisis, will need less than 10 billion euros ($13.3 billion) to be bailed out, less than forecast in a draft version of the loan deal the country is discussing with international creditors from the European Union and the International Monetary Fund.

Debt inspectors are now working on a report to determine the exact amount that Cypriot banks will need to replenish their capital buffers. The sum will help determine how much in rescue loans the Cypriot government will get, the AP reports.

If the banks require the full EUR10 billion--a figure equal to more than half the country's EUR17.5 billion gross domestic product--the country's debt burden would be deemed unsustainable.

Write to Alkman Granitsas at alkman.granitsas@dowjones.com

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