Citing a source familiar with the matter, the Wall Street Journal reported that the Google decision will be discussed by EU commissioners on Wednesday. That source claimed to the news outlet that European antitrust chief Margrethe Vestager made the decision to file charges after consulting with European Commission President Jean-Claude Juncker.
Google faces fines of as much as $6.6 billion if the charges are proven.
Google shares traded down about 1.6 percent on Tuesday, although most of those losses came in the morning. The stock was largely unchanged in after-hours trading.
Reuters had reported earlier that Google was likely to learn more on Wednesday about how Vestager will treat complaints about its market dominance.
However, industry and EU sources suggested to Reuters that Vestager (who took over as EU competition commissioner in November and has indicated she will not be rushed into concluding the five-year-old inquiry) was unlikely to announce charges against the U.S. Internet search giant.
A European Commission spokesman declined comment on Tuesday on whether Vestager, who is due to fly to the United States on Wednesday afternoon, would make a statement after the weekly meeting of all 28 EU commissioners in the morning.