Greece two weeks from cash crisis - Yanis Varoufakis
Greece's finance minister says his country's financial situation is "terribly urgent" and the crisis could come to a head in a couple of weeks.
Yanis Varoufakis gave the warning after eurozone finance ministers met in Brussels to discuss the final €7.2bn tranche of Greece's €240bn EU/IMF bailout.
Ministers said Greece had made "progress" but more work was needed.
The Greek government is struggling to meet its payment obligations.
Earlier, Greece began the transfer of €750m (£544m, $834m) in debt interest to the International Monetary Fund - a day ahead of a payment deadline.
"The liquidity issue is a terribly urgent issue. It's common knowledge, let's not beat around the bush," Mr Varoufakis told reporters in Brussels.
"From the perspective [of timing], we are talking about the next couple of weeks."
Greece has until the end of June to reach a reform deal with its international creditors. Its finances are running so low that it has had to ask public bodies for help.
The crisis has raised the prospect that Greece might default on its debts and leave the euro.
The eurozone is insisting on a rigorous regime of reforms, including cuts to pensions, in return for the bailout, but Greece's anti-austerity Syriza-led government is resisting the tough terms.
In a statement, the eurozone finance ministers said they "welcomed the progress that has been achieved so far" in the negotiations, but added: "We acknowledged that more time and effort are needed to bridge the gaps on the remaining open issues."
Eurogroup chairman Jeroen Dijsselbloem said there had to be a full deal on the bailout before Greece received any further payments.
"There are time constraints and liquidity constraints and hopefully we will reach an agreement before time runs out and before money runs out," he said.
There had been fears that Greece would default on its IMF debt repayment due on Tuesday.
However, a Greek finance ministry official was quoted as saying that the order for repayment had been executed on Monday. Almost €1bn has been handed over to the IMF in interest payments since the start of May.
It is unclear how the government came up with the funds, but the mayor of Greece's second city Thessaloniki revealed last week that he had handed over cash reserves in response to an appeal for money.
Syriza has said it will not break its anti-austerity electoral promises, and that has raised the prospect of a referendum on any deal agreed in Brussels.
Germany's finance minister, Wolfgang Schaueble, has lent support to the idea.
"Maybe this would be the right measure to let the Greek people decide if it is ready to accept what is necessary," he said.
Greek economy in numbers
- Unemployment is at 25%, with youth unemployment almost 50% (corresponding eurozone averages: 11.4% and 23%)
- Economy has shrunk by 25% since the start of the eurozone crisis
- Country's debt is 175% of GDP
- Borrowed €240bn (£188bn) from the EU, the ECB and the IMF