He was an excellent soccer player, yet not as good as his brother Harald who won a silver medal playing soccer for Denmark. Niels made some good friends while at school but his best friend throughout his life was his brother Harald.
Siya ay isang mahusay na soccer player, hindi pa bilang mabuting bilang kanyang mga kapatid na lalaki Harald na napanalunan ng isang pilak medalya paglalaro ng soccer para sa Denmark. Niels ginawa ng ilang mabuting kaibigan, habang nasa paaralan ngunit ang kanyang pinakamatalik na kaibigan sa kabuuan ng kanyang buhay ay ang kanyang mga kapatid na lalaki Harald.