The European Commission has launched an investigation into Google after other search engines complained that the firm had abused its dominant position.
The body said it would look into whether the world's largest search engine lowered the ranking of competing services in its results.
The probe follows complaints by British price comparison site Foundem and French legal search engine ejustice.fr.
The EU will also investigate its online advertising platform.
"The European Commission has decided to open an antitrust investigation into allegations that Google has abused a dominant position in online search," the Commission said.
It said the action followed "complaints by search service providers about unfavourable treatment of their services in Google's unpaid and sponsored search results coupled with an alleged preferential placement of Google's own services."
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