A Microsoft and Yahoo search deal, announced in July, will face an in-depth antitrust review from the U.S. Department of Justice, Microsoft has confirmed.

The DOJ requested additional information about the deal earlier this week, Microsoft spokesman Jack Evans said. Microsoft expected the DOJ to look into the agreement and conduct a "thorough review," he added.

"When we announced the agreement, we said we were hopeful it would close by early next year," Evans said.

A DOJ spokeswoman said she couldn't comment on the Microsoft/Yahoo deal.

Under the deal, Microsoft's Bing search engine will power Yahoo's search site, and Yahoo will sell premium search advertising services for both companies.

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