Iker Casillas blamed Mourinho 's demand for a siege mentality for the deterioration of their relationship .
The situation was complicated by Spain 's international dominance , where Barcelona and Real players formed the bulk of an all - conquering national side .
Iker Casillas blamed Mourinho 's demand for a siege mentality for the deterioration of Barcelona 's relationship .
The situation was complicated by Spain 's international dominance , where Barcelona and Real players formed the bulk of an all - conquering national side .