David Jean Nielsen (born 1 December 1976) is a Danish former professional footballer and manager of Danish Superliga team AGF Aarhus.He played for a number of Danish clubs, as well as Fortuna Düsseldorf in Germany and English clubs Grimsby Town, Wimbledon and Norwich City.
His greatest triumph was the 1997 Danish Cup victory, which he won with Danish club F.C.
Copenhagen.
He played 46 matches and scored 33 goals for various Danish youth national teams between 1992 and 1997, including eight games and three goals for the Denmark national under-21 football team.
Nielsen has attracted controversy at various times in his career for falling into serious gambling debt, assaulting a teammate and then, in November 2008, admitting matchfixing in a Danish game played in 2004.