Niall played with St Patrick's Athletic's U19 side in 2011/12 and made his first team debut as a substitute in the Leinster Senior Cup final win over Bohemians in October 2011. He lef Pats at the end of 2011 and played briefly with Shelbourn'e's U19s before dropping to the Leinster Senior League with Moyle Park.

In December 2012 Niall signed for Roddy Collins at Athlone Town and made his club debut in a scoreless draw against Mervue United on the opening weekend of the 2013 season. He made 15 league appearances as Athlone won the 2013 First Division title.

Niall left Athlone at the end of the 2016 season and joined Moyle Park, where he played until January 2017 when he signed for Owen Heary at Shelbourne.