Katsouranis became one of Greece's impact players in their UEFA Euro 2008 qualifiers in which he helped Greece qualify for the finals and have a chance to retain their crown. Their UEFA Euro 2008 campaign resulted in poor fashion as Greece failed to pick up a point. Katsouranis has captained Greece on several occasions and was selected for his country in the 2010 FIFA World Cup qualification. Together with Angelos Charisteas, Giourkas Seitaridis, Georgios Karagounis, Kostas Chalkias who all participated in Greece's UEFA Euro 2004 triumph, he led Greece to a 2–1 win against Nigeria, its first win in a World Cup tournament.