The ECB has started winding down a two-year campaign against high inflation that followed the brisk reopening of the economy after the COVID-19 pandemic and Russia's invasion of Ukraine.

Inflation in the 20 countries sharing the euro currency fell to 2.2% this month, the slowest pace since July 2021 and closing in on the ECB's 2% target, according to a flash reading by the European Union statistics office, Eurostat.

While the fall was mostly driven by lower energy prices and may even reverse later this year, it was still likely to seal the deal on a second ECB rate cut on Sept 12 after a first move in June.

"The significant drop in headline inflation in August makes the September cut a foregone conclusion," said Tomas Dvorak, a senior economist at Oxford Economics.

Even ECB board member and prominent policy 'hawk' Isabel Schnabel appeared to open the door to more easing on Friday, saying further gradual rate cuts might not derail the disinflation process as some policymakers had feared.

Still, the report showed price growth in the services sector - which is closely watched by policymakers because it better reflects domestic demand rather than external conditions - accelerated to 4.2% from an already high 4.0%.

This was the probable result of a boost from the Olympic Games in Paris, but also greater spending power by workers after some recent pay increases.

"This likely reflects a relatively tight job market, as the decrease in the unemployment rate in July shows," said Gian Luigi Mandruzzato, senior economist at EFG Asset Management.

For now, markets see about six rate cuts before the end of next year, roughly one more cut than is baked into the ECB's own economic projections, indicating that markets are more optimistic about the price outlook than the ECB.

This is partly because market economists see a bigger dip than the ECB's own staff in inflation this autumn.

Policymakers say they will not be confident in the inflation outlook until wage growth slows, with Germany's central bank especially vocal about this risk.

Still, with inflation now within a whisker of the ECB's target, the euro zone's central bankers were likely to broaden their debate from the single-minded focus on inflation to take into account signs of economic weakness.

Wage growth has slowed sharply and unemployment is already rising in around a quarter of the euro zone's 20 countries. Survey data among firms and households suggest there is further labour market deterioration in store.

Lending has dwindled to a trickle since the ECB jacked up rates last year, causing investment to dry up and hampering sectors that rely on it, such as construction and manufacturing.

This has left euro zone economic growth barely humming along for over a year, with weakness in industrial powerhouse Germany only partly offset by strength in services-oriented countries such as Spain.

"We think the ECB is already behind the curve, fixated too much on current and narrow measures of inflation while not paying enough attention to weak growth, with potential long-term damaging impacts," Oxford Economics' Dvorak said.