Speaking at the World Economic Forum's "virtual Davos", Villeroy said ECB policy would be focused on ensuring inflation subsides soon and stabilises around its 2% target, down from 5% in December in the euro zone.

"We think that this gradual and sequential approach - first tapering, second lift off, and eventually downsizing - is appropriate. But we keep our full optionality about the speed of this sequence, and will definitely be data driven," Villeroy said.

(Reporting by Leigh Thomas; Editing by Hugh Lawson)