Germany's Economy Minister is urging Greece to forge ahead with austerity measures demanded as part of the country's bailout, saying they are not up for negotiation.

Philipp Roesler told ARD television Thursday that in his opinion "there can be no rebates on reforms."

The comments come as Europe's leaders await the report by inspectors from the so-called "troika' of the International Monetary Fund, the European Union and the European Central Bank on Greece's progress in implementing the measures.

Roesler says the focus now is on reforms, not further bailout funds.

He says "it's clear to everyone that we can't line up another package for Greece. We also don't want that - instead we seek the implementation of the agreed-upon reforms."