In a blog posting Tuesday, Google indicated that the grievances revolve around how it ranks Web sites in its search results and the online advertising system that generates virtually all its revenue.
Google didnt say whether the European Commission has opened a formal investigation.
The complaints were filed by: Foundem, a price comparison service in England; ejustice, a legal search engine in France; and Ciao, a European shopping search engine owned by Google rival Microsoft.
Google said its confident all its practices comply with European laws governing fair competition.