Career
Krüger has spent over 30 years researching Australian football (soccer) in an attempt to produce a complete record of all "Socceroos" internationals since 1922. Krüger has compiled a large collection of Australian football history, including team photographs, videos, programs and magazine articles The material was researched from his own funds, despite living in Europe. which ironically was the venue for the first time the socceroos qualified for the World Cup.
Krüger was well known in the German media during the 2006 World Cup, and often referred to as "the biggest fan of the Socceroos".