The Ecuadorian has featured prominently for his national team since his debut in 2006 against Columbia and played at the 2006 World Cup
Castillo moved to the Premier League via the Balklands and Red Star Belgrade, having made his name in his native Ecuador.
He moved from Club Deportivo El Naconal in August 2006 and ended up scoring 8 goals in his first season at Red Star. He played a vital role in the club winning a domestic double in 2007, and it was this form (and perhaps budget restraints) that prompted David Moyes to acquire the player initially on loan.
The Ecuadorian has featured prominently for his national team since his debut in 2006 against Columbia and played at the 2006 World Cup.