What is the nationality of the football league system that Nicolai Poulsen plays in?  
Nicolai Poulsen: Nicolai Poulsen (born 15 August 1993) is a Danish footballer who currently plays as a midfielder for Sarpsborg 08 in the Eliteserien. Eliteserien (football): Eliteserien (] ) is a Norwegian professional league for association football clubs.
i don't know