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.
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Derbyshire Constabulary has referred itself to the Independent Police Complaints Commission.
Cloudy and dry tonight. Brighter tomorrow.
Cloudy and humid overnight Some warm sunshine developing tomorrow.