Verbeek was the assistant coach of the South Korean national team under Guus Hiddink at the 2002 FIFA World Cup and also under Dick Advocaat at the 2006 FIFA World Cup.
Verbeek acted as an assistant coach for the South Korean national team during both the 2002 FIFA World Cup, when he worked with Guus Hiddink, and the 2006 FIFA World Cup under Dick Advocaat.