[2] His first league goal was the winner for Dundalk at Eamonn Deacy Park on 4 November 1995.
Long made a substitute appearance in the 1995–96 UEFA Cup at the Malmö Stadion [3] On 29 April 2014, he was named as manager of Athlone Town.
[4] He could not prevent Athlone Town's relegation from the League of Ireland Premier Division and departed the club to become manager of Bohemians on 30 October 2014.
[5] On 30 August 2022, a day after a 3–1 home defeat to St Patrick's Athletic, he was sacked by Bohs without winning a major trophy during his 8 years at the club.
[6] On 29 March 2023, Long was appointed manager of League of Ireland First Division club Waterford.