European antitrust regulators identified four areas of concern about Google Inc.'s business practices, but gave the Internet giant the opportunity to offer concessions to settle the case.

EU Competition Commissioner Joaquín Almunia for the first time spelled out issues the European Commission found in its two-year probe of the Mountain View, Calif.-based company. The concerns raised by Mr. Almunia—including allegations that Google unfairly discriminates against rivals in its search results as well as advertising contracts—aren't...