German Finance Minister Wolfgang Schäuble called on central banks to take into account price distortions that monetary policy could have on markets and help prevent asset bubbles, in an interview published on Monday.
Schäuble sees "signs of bubbles forming on parts of the real estate markets," he said in a joint interview with French counterpart Michel Sapin in Handelsblatt.
"We cannot just leave the prevention of (asset) bubbles to the state supervisors. Central banks must keep that in mind when they take their decisions about money supply," Schäuble was quoted as saying.
But even as Schäuble reiterated his warning that ultra-loose monetary policy could lead to distortions on asset markets, he rejected French calls for the European Central Bank (ECB) to purposely weaken the value of the euro.
"I think nothing of political discussions about the exchange rate. It is formed on the market. If politics looks after that, it will not lead to good results," he said.
French officials have called for the ECB to weaken the euro and thereby help make euro zone economies more competitive.
The ECB targets price stability, which it defines as just under but close to 2 percent consumer price inflation.
The joint interview comes against the backdrop of a debate among policymakers in the single currency area about the flexibility of their rules on government budgets and spending.
Sapin said France was not looking for extra time to meet its deficit targets.
"It is not about asking for more time. I want to stick to the European rules and, together with the partners, find the right timing to lower our spending and deficits and at the same time support growth," Sapin told Handelsblatt.
"Sustainable growth is not possible with continued, high deficits," Sapin said.
In another interview published on Sunday, the head of Germany's Sparkassen savings banks association said he feared that expansive monetary policy could lead to price bubbles.
"Because so much money is coming from all angles, we are once again seeing that irresponsible risks are being taken," Georg Fahrenschon told Welt am Sonntag.
Schäuble also said, however, that the banking sector as a whole was now less risky after banks had acquired additional capital.
"There will always be problems ... but the danger of contagion is much lower," he was quoted as saying.