Yahoo has appointed Henrique de Castro, a former vice president at Google, as its new chief operating officer (COO).

In his role, de Castro will oversee the company’s sales, operations, media and business development globally and after joining in January 2013, de Castro will report directly to the company’s CEO Marissa Mayer.

Mayer said: "His operational experience in Internet advertising and his proven success in structuring and scaling global organizations make him the perfect fit for Yahoo! as we propel the business to its next phase of growth."

Most recently, de Castro led Google’s worldwide Partner Business Solutions group responsible for advertising platforms and services for the search engine’s publisher as well as commerce partners.

de Castro also led Google’s media, mobile and platforms organisation, where he helped to grow the business significantly.

Prior to joining Google in 2006, de Castro spent two years at Dell, where he managed sales and business development operations across Western Europe.

In September this year, Yahoo had hired Ken Goldman as new chief financial officer replacing the existing CFO Tim Morse.

Yahoo is finding it difficult to reorganise its core online display advertising business in order to compete with Google and its email business is being hurt the by the social networking websites that include Facebook.

For the second quarter of 2012, Yahoo posted $1.08bn revenue, flat compared to $1.076bn it had recorded during the corresponding quarter in 2011.