Manchester United are again the world's most powerful club.

The bi-annual results of the football marketing study by the University of Navarra and the International University of Catalunya have again been published this week.

United has succeeded last year's No1 club, Real Madrid, which has dropped to fourth position. Chelsea are second behind United and ahead of third-place Barcelona.

United also boast the two biggest names in football - Cristiano Ronaldo at No1 and Wayne Rooney at No2.

The highly-respected University study reaches its results from the popularity of players and clubs by the news they generate in the world-wide media.