[3][4] Despite departing the team shortly after, Nielsen received acclaim for his work and finished runner-up in the 2017 The Best FIFA Women's Coach award.

[6] On 12 December 2024, Nielsen was appointed as the new coach of the Japan women's national football team.

When he was five, his parents separated, and with his mother he moved back to Denmark while his father and his brother stayed in Maniitsoq.

To compensate for his weakness, he chose large amounts of muscular strength exercises, and played soccer anyway.

After that accident, he stopped playing, and later chose a career as a trainer and studied sports psychology.