Google says its web advertising deal with Yahoo is on schedule and will not be derailed by US anti-trust scrutiny.
Google will place its adverts next to Yahoo search engine results from early October, as planned.
The deal was announced in mid-June, and the companies gave themselves until early October to get started.
Microsoft has protested to legislators that the deal is uncompetitive for the web ad market.
Google chief executive Eric Schmidt said, "We are going to move forward. We are in the process of talking to the government. They have not indicated one way or the other how they're dealing with us."
The deal is a major plank of Yahoo's strategy to boost its revenue and fight off any potential takeover by Microsoft.