What is the nationality of the soccer player who was the head coach of the under-21 football team that has been playing since 1976?
Denmark national under-21 football team The Denmark national under-21 football team has played since 1976 and is controlled by the Danish Football Association. Before 1976, the age limit was 23 years.
Croatia national under-21 football team The Croatia national under-21 football team, also known as Croatia under-21(s) or Croatia U21(s), is a youth association football national team which represents Croatia at this age level and is a feeder team for the Croatia national football team.