On 31 July 2006, Fidel Castro's personal secretary, Carlos Valenciaga, announced on state-run television that Fidel Castro would provisionally hand over the duties of First Secretary of the Communist Party of Cuba (party chief), President of the Council of State of Cuba (head of state), President of the Council of Ministers of Cuba (prime minister), and Commander-in-Chief of the Armed Forces to Raúl Castro while Fidel underwent and recovered from intestinal surgery to repair gastrointestinal bleeding.
Ballack's debut for Chelsea came on 31 July 2006, during a practice match at UCLA's intramural football pitch. Chelsea presented him to the media the following day where the club also gave him his favoured number 13 shirt, worn throughout his career.