European Central Bank policymakers have sought to reassure investors rattled by a new variant of the coronavirus, arguing that the euro zone's economy had learned to cope with successive waves of the pandemic.

Carrying a "very high" global risk of surges according to the World Health Organization, the Omicron variant is threatening a brisk economic revival.

It could also jeopardise plans by the ECB and other global central banks to dial back emergency support after nearly two years.

But ECB President Christine Lagarde, her deputy Luis de Guindos and French governor Francois Villeroy de Galhau put on a brave face.

"There is an obvious concern about the economic recovery in 2022, but I believe we have learnt a lot," Lagarde told Italian broadcaster RAI last night.

"We now know our enemy and what measures to take. We are all better equipped to respond to a risk of a fifth wave or the Omicron variant," she said.

She was echoed by her fellow countryman and ECB policymaker Francois Villeroy de Galhau who said "successive waves have proven so far to be less and less damaging, and this one shouldn't presumably change the economic outlook too much".

ECB vice-president Luis de Guindos acknowledged the "high degree of uncertainty" and called for keeping all policy options open but he argued much higher vaccination rates should help Europe better deal with these risks.

But Spain's central bank governor Pablo Hernandez de Cos said the ECB should "err on the side of caution" when setting policy and ventured a prediction for no hike in interest rates until "some time" after next year.

Markets regained composure today as investors awaited further details of the variant, which has made some countries reimpose travel curbs.

The ECB is under pressure to reduce its monetary stimulus, starting from its €1.85 trillion Pandemic Emergency Purchase Programme (PEPP), as euro zone inflation makes multi-decade highs above 4%.

De Guindos said on Friday that PEPP would end in March as planned and the debate among policymakers has mostly been on what comes next, possibly including increased purchases under the ECB's regular Asset Purchase Programme.

In a sign of caution, consumer sentiment in the euro zone started turning south even before news of the variant broke last week, data showed today, and mobility also declined.

But the ECB has pledged to run PEPP only until the damage wrought to inflation by the pandemic is repaired.

This has arguably happened, with inflation in the euro zone seen hitting 4.4% this month and staying above the ECB's 2% target next year.

ECB board member Isabel Schnabel said earlier inflation likely peaked in November and there was "no indication" it would settle above the ECB's goal.