European Central Bank policymaker Jens Weidmann said that the ECB should keep a distance from governments by resisting pressure to bail out indebted states or pursue goals other than price stability.

The outgoing Bundesbank chief expressed his concern that the ECB will be pressured to continue buying bonds to finance debt-ridden governments. 

"Central banks must avoid becoming caught up in fiscal policy," he warned. "In the face of large sovereign debt, monetary policy should be careful of any pressure to keep their ultra-loose stance longer than the price outlook dictates."

The ECB has amassed 4.5 trillion euros ($5.11 trillion) in government bonds and has promised to keep buying for as long as required, as well as keeping interest rates around zero until inflation stabilises at 2%.

ECB's Weidmann Mounts Defence Against Calls for More Stimulus | Investing News | US News

After a decade of mainly fruitless opposition to the ECB's largesse under successive presidents, Weidmann will stand down five years ahead of schedule on December 31. His successor is expected to be chosen soon by Germany's new government.

However, he will continue to be in charge at the ECB's Governing Council meeting on December 16, when rate-setters will debate whether to wind down emergency bond purchases and whether to raise the pace of purchases through other programmes.

Weidmann also voiced his scepticism about requests for the ECB to pursue other goals, such as fighting climate change or inequality, which have been raised by lawmakers and activists.

"The more broadly central banks interpret their monetary policy mandate, the more likely they are to become enmeshed in politics," Weidmann said. "That would increase the chances of them being overburdened with new goals and wishes, and their independence would be called into question."