WASHINGTON—U. S. Treasury Secretary Jacob Lew on Thursday pressed his counterparts in Germany and France to ensure Greece's debt is made sustainable as eurozone creditors negotiate a new emergency-financing package for the country.

The U.S. is concerned the eurozone's debt-relief efforts will be insufficient to fix Greece's economic woes as Germany continues to question the need for a debt restructuring. Mr. Lew's unscheduled visits to Berlin and Paris Thursday are designed to ramp up the pressure on Greece's creditors. Although the administration sees recent efforts by Athens and its creditors as creating the conditions for Greece to stay in the eurozone, Washington is still concerned about the risks of an exit from the currency union.

Mr. Lew "underscored the importance of achieving debt sustainability in the upcoming negotiations," the Treasury Department said in an readout of talks.

Without some form of debt restructuring, a senior U.S. Treasury official said, "this problem will just come right back."

Although administration officials say the U.S. and Europe are far more insulated against potential fallout from a Greek exit than in previous years, Washington is still fearful it could spur volatility in markets and undermine weak global growth. The U.S. is also concerned about broader political ramifications for its closest allies.

"Secretary Lew said such a path is in the best interests of Greece, Europe, and the global economy," the Treasury department said.

Debt-relief is at the heart of talks now that Athens has passed controversial austerity measures designed to assure creditors the government is committed to reining-in spending and will deliver on a host of other economic overhauls.

Eurozone authorities have promised to discuss reducing Greece's debt burden if Athens meets creditor demands. Absent stronger debt-relief commitments, Washington is worried Athens won't be able to persuade the public to support the economic policies creditors are requiring.

But the currency union's fiscal hawks, led by Germany, have ruled out a strategy many economists say would be the most straightforward way to cut Greece's mountain of debt: Writing down of the face-value of the government bonds Europe holds. Berlin has said it is open to considering extending the maturity of those bonds, but disagrees with its other creditors about the extent of debt relief needed and says a better option may be to let Greece leave the euro.

"If all the steps are taken, there will be a very serious effort on restructuring the debt," a senior Treasury official said. "Whether it will go far enough is a different question."

Using its own dwindling leverage in bailout negotiations, the International Monetary Fund is also pushing the eurozone for a large-scale restructuring. Fund officials have warned the eurozone it won't join the bailout without substantial debt relief.

Germany says the IMF's assessment is too dour, however.

The senior U.S. official said the IMF's decision to make public a report detailing the critical state of Greece's economy, a move fund-watchers called highly unusual for the institution, should help shape debt-discussions in the eurozone.

Stacy Meichtry contributed to this article.

Write to Ian Talley at ian.talley@wsj.com

Access Investor Kit for Treasury Group Ltd.

Visit http://www.companyspotlight.com/partner?cp_code=P479&isin=AU000000TRG4

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

Treasury Group Ltd (ASX:TRG)
Historical Stock Chart
From Apr 2024 to May 2024 Click Here for more Treasury Group Ltd Charts.
Treasury Group Ltd (ASX:TRG)
Historical Stock Chart
From May 2023 to May 2024 Click Here for more Treasury Group Ltd Charts.