Prime Minister Antonis Samaras needs to convince the rest of the eurozone of Greece's efforts

Greek Prime Minister Antonis Samaras is to hold meetings with eurozone leaders this week, which could help determine the fate of his country in the bloc.

Mr Samaras is expected to request more time to meet deficit cutting targets.

At issue is whether international authorities will release loans worth 31.5bn euros ($38.8bn; £24.7bn) next month.

The Greek PM will meet German Chancellor Angela Merkel and French President Francois Hollande.

However, the German leader's spokesman played down the significance of the talks.

"I can tell you what is not expected... that strong positions will be laid out or significant decisions taken. That will not happen," Steffen Seibert told reporters.

This week's round of meetings is due to begin later when Greece's foreign minister Dimitris Avramopoulos meets his German counterpart Guido Westerwelle in Berlin.

On Wednesday, Mr Samaras is expected to meet Jean-Claude Juncker, the Luxembourg premier who heads the group of eurozone finance ministers.

German government spokesman Mr Seibert said: "The basis for all decisions in the case of Greece is the report of the Troika."

Inspectors representing the EU, International Monetary Fund and the European Central Bank are assessing Greece's progress on implementing reforms, in particular its spending cuts and efforts to raise revenue by clamping down on tax evasion. Their findings will be published in September.

Stuck in recession, Greece is heavily in debt and has implemented more than 43bn euros (£33.8bn) worth of austerity measures since 2010 in order to try to bring down its budget deficit.

The German weekly Der Spiegel has reported that an initial assessment by the inspectors suggested Greece may need to cover a financing hole of up to 14bn euros over the next two years, rather than the 11.5bn Athens has identified for 2013 and 2014.

Last week, Greece was able to raise 4.06bn euros with an issue of three-month treasury bills, but the government had to offer an interest rate of 4.43% to attract investors.

It was expected to use this money to make a 3.2bn euro repayment, due to the European Central Bank on Monday. The ECB declined to comment on whether it had yet received the funds.

Mr Samaras' expected plan to request a two-year extension on its austerity programme has provoked frustration among other European politicians with Athens.

"There's a process we're engaged in to evaluate the efforts made by Greece in recent months, which we know was set back by elections," European Affairs Minister Bernard Cazeneuve said on France's Europe 1 radio. "We'll evaluate the situation and try to take a common position."

"It's important to let the Greeks express their request clearly, to let the Troika report and then to hold discussions between European countries to find the right position," he added. "We want countries to meet their commitments and we want the European Union to create conditions that will generate growth."

In an interview with Deutschlandfunk radio, Germany's deputy finance minister, Steffen Kampeter, said: "It is important that both sides should keep to what we agreed. We will decide in an orderly, fair and transparent procedure in Europe. The key to this lies not in Berlin, but in Athens."

Alexander Stubb, Finland's minister for European affairs and foreign trade, told reporters: "There will be no third (aid) package if it [Greece] does not make structural reforms,"

Greece's difficulty in honouring its commitments has stirred fresh speculation over its exit from the euro.

On Saturday, German Finance Minister Wolfgang Schaeuble said: "I have always said that we can help the Greeks, but we cannot responsibly throw money into a bottomless pit."

Joerg Asmussen, a German member of the ECB's executive board said that a Greek exit would be "manageable", albeit expensive, and would result in higher unemployment.