BRUSSELS — Greece was pulled back from impending default Saturday, when eurozone finance ministers signed off on a vital loan installment. But the country’s international creditors are showing more concern over whether it can service its debt in the long run.

Athens will get a $17.39 billion tranche of its existing $159.62 billion rescue package by July 15, in time to meet several bond repayment deadlines this month and next, the finance ministers of the 17 countries that share the euro said in a statement Saturday evening.

The eurozone and the International Monetary Fund will also continue to prop up Greece’s struggling economy in the coming years, with a second package of aid loans to be finalized by September.

While the renewed commitments save Greece from immediate collapse, even its international creditors – long the biggest optimists on the country’s prospects – are warning that getting down a debt of 160 percent of economic output will be a difficult balancing act.

“The Greek government debt will remain for many years at a high level and, therefore, subject to possible adverse developments that cannot be predicted,” the European Commission, the EU’s executive and one of the three institutions in charge of Greece’s bailout, said in a report published Saturday.

Especially lower-than-expected economic growth “would put the debt trajectory on a clearly unsustainable upward path,” the commission said.

In an illustration showing several scenario’s for Greece’s debt load, growth of just 1 percentage point below expectations would leave Greece’s debt around 170 percent of gross domestic product past 2020, with the graph pointing firmly upward.

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