Leaders of France and Germany have told Greece's government the door for negotiations with creditors remains open but urged it to make credible proposals at a eurozone summit to reach a cash-for-reform deal, ABC News reported on Monday.

"The door is open for discussion," French president Francois Hollande told reporters, standing next to German chancellor Angela Merkel after talks at the Elysee Palace.

He said the two of them had taken note of the message sent earlier by Greek political parties expressing their desire for Greece to remain in the eurozone.

"It's now up to the government of Alexis Tsipras to offer serious, credible proposals so that this will can be turned into a program which gives a long-term perspective, because Greece needs a long-term perspective in the eurozone with stable rules, as the eurozone itself does."

But he added: "I stress that there is not much time."

Merkel said the conditions for a discussion on a program involving the European Union's bailout fund were not yet in place and urged Greece to put proposals on the table this week.

"We say very clearly that the door for talks remains open and the meeting of eurozone leaders tomorrow should be understood in this sense," she said.

"But at the same time we say that the requirements for starting negotiations about a concrete ESM (European Stability Mechanism) program are not present at the moment."