Germany's parliament is unlikely to approve a third financial rescue package for Greece, a senior member of Chancellor Angela Merkel's governing coalition says.
The comments by Rainer Bruederle, the parliamentary leader of the Free Democrats party, indicate growing pessimism among German leaders at Greece's ability to satisfy creditors' demands for economic reform.
Bruederle told rbb-Inforadio in an interview on Saturday it appeared the troika of auditors from the European Union, European Central Bank and International Monetary Fund wasn't getting satisfactory answers from the Greek government on its promised reforms.
Greece's creditors are demanding the conservative-led government slashes a further 11.5 billion euros ($A14.10 billion) in budget costs over the next two years, requiring further painful wage and pension cuts that the country's three-month-old coalition had promised to avoid.
Bruederle said Greece might be given "several more weeks" to implement the reforms to make up for delays caused by two elections but that the country can't expect more money from other members of the 17-nation eurozone if it doesn't fulfill its part of the bailout agreement.
"I can't imagine that a further package for Greece would get a majority in the Bundestag or in the governing coalition," Bruederle said.
"We Germans are helpful but we're not stupid."
If Greece doesn't receive further funds it would have to print money to avoid bankruptcy, something it can only do if it leaves the eurozone and adopts its own currency, he said.
Bruederle added that such a decision would have to be taken in Athens, not Berlin or Brussels.