"We must implement our monetary policy robustly. In the foreseeable future, the Eurosystem will also have to reduce its bond holdings," Nagel said in a interview with newspaper Sueddeutsche Zeitung .

Nagel said Germany's economic output will probably see a slight decline in economic output as early as the third quarter this year which will likely intensify in the fourth quarter and continue in early 2023.

"But at the moment I assume that it will not be a deep slump. The labour market is also currently very robust," he added.

Germany's 2023 inflation will likely be 6% or more, above the 5.5% inflation forecast for the Euro Zone, he said.

(Reporting by Riham Alkousaa; Editing by Ludwig Burger)