During his studies at Mary Immaculate College, Reidy was selected for the college's senior hurling team during his second year. On 27 February 2016, he won a Fitzgibbon Cup medal when Mary Immaculate College won their first ever title after a 1-30 to 3-22 defeat of the University of Limerick.[1]
On 15 October 2013, Reidy lined out at centre-forward when Dromin-Athlacca faced Knockaderry in the Limerick Intermediate Championship final. He scored 1-02, including a point from a free, and collected a winners' medal following a 2-18 to 1-15 victory.[2]
On 27 October 2018, Reidy lined out in a second Limerick Intermediate Championship final. He top scored for Dromin-Athlacca with 0-09 and collected a second winners' medal following a 2-15 to 0-14 defeat of Croom.[3]
Limerick
Minor and under-21
Reidy first played for Limerick as a member of the minor team during the 2011 Munster Championship. He made his first appearance for the team on 27 April 2011 when he lined out at right wing-forward in a 2-14 to 0-12 defeat of Cork.[4]
Reidy was drafted onto the Limerick under-21 team for the 2013 Munster Championship. He made his only appearance in the grade on 31 May 2013 when he scored a point from left wing-forward in a 2-18 to 2-11 defeat by Tipperary.[5]
Senior
Reidy was just 19-year-old when he was added to the Limerick panel for the 2013 National League.[6] On 14 July 2013, he won a Munster Championship medal as a non-playing substitute following a 0-24 to 0-15 defeat of Cork in the Munster final.[7]
On 23 February 2014, Reidy made his first appearance for the Limerick senior team when he came on as a 21st-minute substitute for Donal O'Grady and scored a goal in a 3-26 to 0-12 defeat of Antrim in the National League.[8] On 3 July 2014, he was an unused substitute when Limerick suffered a 2-24 to 0-24 defeat by Cork in the Munster final.[9]
Kildare
In January 2017, Reidy transferred to the Kildare senior hurling team.[10] He made his first appearance for the team on 12 February 2017 and scored 0-06 in a 1-18 to 1-15 defeat of Armagh in the National League.[11] Reidy ended the league as Kildare's top scorer with 2-42 in five games. He was also top scorer in Kildare's Christy Ring Cup campaign with 0-24.
Limerick return
In November 2017, it was announced that Reidy was returning to the Limerick senior hurling team.[12] On 19 August 2018, he was an unused substitute when Limerick won their first All-Ireland title in 45 years after a 3-16 to 2-18 defeat of Galway in the final.[13]
On 31 March 2019, Reidy was a member of the extended panel but failed to make the match-day panel when Limerick defeated Waterford by 1-24 to 0-19 to win the National League title.[14] On 30 June 2019, he won a second Munster Championship medal after coming on as a substitute for Tom Morrissey in Limerick's 2-26 to 2-14 defeat of Tipperary in the final.[15]