Greece is preparing to present a list of reforms to lenders in order to secure a bailout extension.
The list to be submitted on Monday must be approved by international creditors to secure a four-month loan extension.
Analysts say a collapse of the deal would revive fears of a Greek exit from the euro.
Minister of state Nikos Pappas said the list would include measures to tackle tax evasion and streamline the civil service.
Germany’s Bild daily newspaper, citing an unnamed source, reports that Greece aims to recover 7.3bn euros (£5.4bn; .3bn) with measures to combat tax evasion.
A spokesman for the German finance ministry, Martin Jaeger, was quoted as saying by Reuters news agency that Berlin expected the Greek plan to be “coherent and plausible”.
Greece agreed at a meeting with its European Union and International Monetary Fund (IMF) lenders on Friday to submit the list of reforms before Tuesday.
Bild, Germany’s biggest-selling newspaper, was publicly attacked on Friday by Greek Finance Minister Yanis Varoufakis who remarked about an earlier story: “One must believe @BILD’s tall stories [about Greece] at one’s peril.”
In a new article (in German) the tabloid breaks down what it says is a tax hit list devised by the Greek government.
It will reportedly seek to raise 2.5bn euros from the fortunes of rich Greeks, 2.5bn from back taxes owed by individuals and businesses, and 2.3bn from a crackdown on tobacco and petrol smuggling.
Mr Jaeger said the Greek reform plan, once received, would be examined by Greece’s three creditors – the European Central Bank, the European Commission and the IMF.
Once the three lenders had delivered their opinion, it would be discussed by eurozone finance ministers in a conference call on Tuesday, he said, according to Reuters.
On Friday, German Finance Minister Wolfgang Schaeuble stressed that there would be no payment of new funds to Greece until the conditions of the deal had been met.
Mr Varoufakis has said the bailout agreement will be “dead” if the list of reforms his government is drafting is not approved.
The four-month extension deal is widely regarded as a major climb-down for Prime Minister Alexis Tspiras, who won power vowing to reverse budget cuts.
On Saturday, Mr Tspiras said in a televised address that his government had “won a battle, not the war”.
He called the deal an “important negotiating success” but warned that there was a “long and difficult road ahead”.