In his first season as a professional for Lyngby Boldklub, after joining the first team in fall 2009, he gained high praise from coach Niels Frederiksen.
During his time with SBV Excelsior, he managed to score 13 goals in 27 caps in the Dutch Eerste Divisie, which then caught the attention of Esbjerg fB, where he on 4 July 2013 became new manager Niels Frederiksen's first signing.
Niels Frederiksen is educated in economics, and worked in Danske Bank for several years, while having a part time job as youth coach at B93 and Lyngby Boldklub.
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On 2 May 2013 it was announced that he would succeed Jess Thorup as manager of Esbjerg fB from the beginning of the 2013–14 Danish Superliga season.
Niels Bohr | Niels-Henning Ørsted Pedersen | Niels Bohr Institute | Niels Juel | Niels Ferguson | Niels Henrik Abel | Niels Shoe Meulman | Niels Helveg Petersen | Søren Frederiksen | Niels Frederiksen | Niels Ebbesen | Niels Ditlev Riegels | Niels Viggo Bentzon | Niels Turin Nielsen | Niels "the Terminator" Feijen | Niels Simonsen Glostrup | Niels Rosing-Schow | Niels Peter Lemche | Niels Kristian Nielsen | Niels Kristian Iversen | Niels Feijen | Niels Erik Nielsen | Niels Christian Ditleff | Niels Bjerrum | Niels Bätge | Niels Arestrup | Niels Albert | Niels | Lars Frederiksen | Frederick Niels Larsen |