Some have raised doubts about the lack of strikers in Spain's squad and the poor form of some key players. But Casillas, who himself had a difficult campaign and was second choice for Real Madrid in La Liga, is confident of a repeat triumph.
"Spain travel to the World Cup as absolute favourites. We know it will be hard to win as there are a lot of teams which are playing football very well such as Germany, Portugal, Argentina, Brazil and Holland, who will also see themselves as favourites," said the goalkeeper who hailed the spirit of his teammates.
"We are a team of players who like big challenges and are excited to be able to try and repeat out success."