The euro zone must decide on Monday how to keep Greece on a lifeline but is divided over whether to delay aid payments to Athens to force through unpopular reforms ranging from sacking public workers to selling state assets.
A split in Greece's governing coalition over how to shrink the country's public sector has cast doubt upon Athens' ability to meet the demands of its bailout programme. International creditors said on Monday that "the outlook remains uncertain."
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Eager to avoid a reawakening of the bloc's debt crisis and mindful of elections in Germany in September, euro zone finance ministers meet at 1500 CET (1300 GMT) and will also want to hear from Portugal after last week's political upheaval.
"This is a delicate moment and we cannot drop our guard," said a senior euro zone official involved in preparing the talks. "Nobody wants a return of the crisis."
Greece, which lived beyond its means for more than a decade, has been kept from defaulting by emergency loans since May 2010.
It hopes to get the go-ahead for the release of 8.1 billion euros ($10.5 billion) as part of its 240-billion-euro rescue package, which it needs in part to pay back 2.2 billion euros of bonds in August.
In week-long talks in Athens that ran into Sunday, the Greek government said it was close to convincing the troika of international lenders - the International Monetary Fund, the European Commission and the European Central Bank - that it can meet targets on reforming its economy.
But German Chancellor Angela Merkel, who is seeking a third term in elections on Sept. 22, wants to avoid being seen at home as too generous to spendthrift countries. Berlin is unlikely to support a full disbursement to Greece on Monday evening, officials told Reuters.
The next tranche could be paid in instalments, which would be conditional on Athens meeting so-called milestones on Greek reforms, such as cutting state jobs or privatisations.
Olli Rehn, the EU's commissioner in charge of economic affairs, confirmed on Friday that this was an option. Over the weekend he struck a cautiously optimistic tone, but the troika said in its statement on Monday that "policy implementation is behind in some areas," referring to the slow pace of job cuts.
Greek officials said on Sunday the troika agreed to give Athens more time to make staff cuts and that 25,000 state workers must be moved into a so-called mobility scheme by the end of 2013 - to be transferred or laid off within a year.
Both sides are still discussing a possible cut in VAT on restaurants as part of the country's fiscal programme.
WARNING TO LISBON
Euro zone finance ministers, accompanied by ECB President Mario Draghi, will also deliver a firm message to Portugal that last week's political instability must not derail its plan to return to the debt market in 2014.
Officials are concerned that more upheaval could upset Lisbon's efforts to leave a 78-billion-euro bailout programme as the country's bond yields topped 8 percent last week, a level seen as making new borrowing unaffordable.
Vitor Gaspar, the architect of Portugal's austerity drive under the bailout, resigned last week, citing a lack of public support for cuts into welfare benefits and tax hikes. Unemployment is at a record high of nearly 18 percent.
Hoping to end a rift that threatened to bring down the government, Portugal's prime minister promoted the head of the junior coalition party to be his deputy on Saturday.
"The ministers will give Portugal the message that the country should stick to its obligations," said a euro zone official, who added that the country had funds that give it, unlike Greece, some room for manoeuvre.
Still, Portugal's new finance minister, Maria Luis Albuquerque, is a familiar face to the euro zone ministers, having earlier attended their meetings as an official. "We are reassured by the new minister, by everything we know about her," Draghi told a news conference last week.
The uncertainty has caused unease in Ireland, which is due to return to normal market borrowing and exit its bailout programme in coming months.
"The problems of Portugal and Greece keep on coming back to haunt us," said John Fitzgerald of the Economic and Social Research Institute, a Dublin-based think tank. "With the crisis not put to bed, we are walking in a minefield."