Activision proposal by Microsoft is subject to an EU antitrust investigation.

Microsoft may be need to make concessions in order to allay EU antitrust worries over its $69 billion bid for "Call of Duty" creator Activision Blizzard.

The American software giant, which made the transaction official in January, is wagering that Activision's library of titles will help it better compete with market leaders Tencent and Sony

The transaction may significantly lessen competition on the markets for the distribution of console and PC video games, including multigame subscription services and

or cloud game streaming services, and for PC operating systems, according to the European Commission's preliminary investigation, which was released in a statement.

It said, "The early analysis implies that Microsoft may be able to participate in foreclosure methods vis-à-vis Microsoft's rival distributors of console video games

Microsoft announced that it would collaborate with the EU antitrust authorities to resolve legitimate market concerns.

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