ARTICLE from Realmadrid official site- 30/06/2009

Kaka's presentation served to reveal which shirt number the player will wear. The newest member of Real Madrid will wear the historic number '8', which has been handed over by Fernando Gago, who will now wear the number '5' shirt. Players like Michel and the hero of the Seventh European Cup title, Pedja Mijatovic, also wore the number '8' shirt.