(Reuters) - Online retailer Rakuten Inc has petitioned the Japanese antitrust watchdog against plans by Yahoo Japan Corp and Google Inc to work together on Internet searches and advertising, the Nikkei business daily reported.
In a filing with the Japan Fair Trade Commission earlier this month, Rakuten argued that once Yahoo Japan adopts Google's search and advertising technologies, Google will dominate the Internet in Japan, and pose a threat to free competition, the paper said.
Rakuten became the first major Japanese Internet company to publicly voice concerns about the partnership between Yahoo Japan and Google, which was announced in July, the daily said.
U.S. software giant Microsoft Corp had asked the FTC in August to review the deal, the paper said.
Reporting by Soham Chatterjee in Bangalore; Editing by Unnikrishnan Nair