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Margrethe Vestager issued the warning during an online event on Friday which was reported by Bloomburg.
She said that an investigation was being carried out into the Google ads ecosystem .
The EU had been investigating Google s data practices since 2019 and recently widened the scope of its probe to look at Google s plans to phase out third-party cookies.
Ms Vestager has already slapped Google with billions of pounds worth of fines for breaching competition laws and thwarting rivals of shopping comparison websites.
Google is facing a very large investigation into its advertising business, the EU s competition commissioner has said
Her latest warning comes after news emerged in January that the UK s competition watchdog would probe the firm amid claims it is using its Chrome browser to abuse its position as the dominant power in searches and browsing.
Peter Wright spoke to House of Lords Communications and Digital Committee
Mr Wright is the Editor Emeritus at DMG Media, which owns the Daily Mail
Gary Shipton, from JPI media, also called on tech firms to pay more to publishers
It comes after the UK s competitions watchdog launched probe into algorithms
In Australia, Google has threatened to remove its search engines over new rules