Germany's hardline Finance Minister Wolfgang Schaeuble on Sunday hailed a change in tone in talks with Greece over its next bailout but warned Europe would closely monitor the pace of reforms in Athens.

Ahead of a key vote in the German Parliament Wednesday to approve a third rescue package for its debt-mired eurozone partner, the influential Schaeuble struck an upbeat, conciliatory note.

"After truly arduous negotiations, they understand now in Greece that the country cannot get around real and far-reaching reforms," he told the Bild am Sonntag newspaper.

Schaeuble, who has driven a tough bargain throughout the crisis with Athens, called an agreement reached Friday among the eurozone finance ministers "responsible" and "in keeping with the commitments made at a euro summit in July."

He said that the eurozone countries would now be keeping close watch to ensure that the reforms-for-aid deal "is implemented point-by-point" in Greece.

One of Schaeuble's deputies, Jens Spahn, said that he now expects talks on debt relief given the insistence of the International Monetary Fund, one of Greece's key creditors, on measures to bring Athens' debt mountain down to a manageable size.

But Spahn, seen as a rising star in Chancellor Angela Merkel's conservative Christian Democratic Union, told the Welt am Sonntag newspaper it marked "a decisive step forward that there is a general understanding that this is possible without a haircut" or debt writedown.

Germany has ruled out erasing any of Greece's debt from the books but has indicated it would be open to giving Athens more time to pay its creditors back if it continues to implement pro-market economic reforms.

As Europe's biggest economy and contributor to Greek aid, Germany plays a key role in the emergency package approved by eurozone finance ministers worth up to 86 billion euros ($96 billion).