POTSDAM, Germany—Germany's finance minister says he's confident the country's supreme court will allow the eurozone's permanent rescue fund to go ahead in a closely watched ruling next week.

The Federal Constitutional Court will rule next Wednesday on calls for an injunction blocking the (EURO)500 billion fund, the European Stability Mechanism. The fund, which lawmakers approved in June, needs the participation of Germany, Europe's biggest economy.

Finance Minister Wolfgang Schaeuble said Thursday that the government "is doing everything clearly within the limits of the law and the constitution."

"The ESM does not violate the constitution," Schaeuble said.