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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Windy with outbreaks of showery rain, heavy at times across the region.
Warwickshire Police say Bethany Marie Hill, who was 20, was found with wounds to her neck at a house on Hertford Road on Wednesday evening.
The rain will clear quickly this evening with blustery, locally heavy, showers following, merging at times into longer spells of rain.