Google Inc. co-founder Sergey Brin said after an event at the Mountain View-based company's headquarters that Microsoft's bid for Yahoo is an "unnerving" maneuver, AP reports.

"The Internet has evolved from open standards, having a diversity of companies," Brin told The Associated Press after an event related to the Google Lunar X Prize, a race to land a privately funded robotic spacecraft on the moon.

"And when you start to have companies that control the operating system, control the browsers, they really tie up the top Web sites, and can be used to manipulate stuff in various ways. I think that's unnerving," Grin said, per AP.

Jewish-Russian-American entrepreneur Sergey Brin co-founded Google with Larry Page. He is President of Technology at Google and has a net worth estimated at almost $20 billion.

Yahoo Inc. has officially rejected the buyout offer from Microsoft. Company officials allegedly want at least $40 per share, which means around $12 billion more than the $44.6 billion, or $31 per share, offer.

However, Microsoft isn't ready to let go. "It is unfortunate that Yahoo! has not embraced our full and fair proposal to combine our companies. Based on conversations with stakeholders of both companies, we are confident that moving forward promptly to consummate a transaction is in the best interests of all parties," the Redmond company said in a statement earlier this month.

Yahoo was advised by Goldman, Sachs & Co., Lehman Brothers and Moelis & Company on the Microsoft deal. In the meantime, Yahoo may be evaluating the possibility to restart merger negotiations with AOL, which is owned by Time Warner. Previous talks between Yahoo and AOL have failed due to economic reasons, but at times like this, any option seems to be better than the $45 billion offered by Microsoft.