The singer, who has supported the Rams since he was four, was being filmed at Pride Park for a new film being made about the boy-band.
The film is being directed by Morgan Spurlock, who is the documentary maker behind Supersize Me, where he ate nothing but fast food for 30 days to see what effect it had on his health.
Niall had a kick-about on the pitch with some of his friends before the game kicked off, but no other members of the group were there.
More top news
East Midlands athlete and world record holder Paula Radcliffe is ending her competitive career at the London Marathon today.
Tributes have been paid to a young BBC Radio presenter who lost his battle with skin cancer aged just 33.
Rain slowly clearing to sunshine and showers on Sunday.