Sean Gannon

Shamrock Rovers

Gannon made his senior debut for Shamrock Rovers in February 2011, coming on as a half-time substitute for Craig Sives in a Leinster Senior Cup game away to Dundalk. His league debut came on 12 September when he started in a 1–1 draw with St Patrick's Athletic, his only league appearance of the 2011 season. Gannon was part of the Shamrock Rovers squad that became the first ever Irish side to reach the group stage of European competition when they knocked out Partizan Belgrade in the Europa League 4th qualifying round, however he made no appearances in qualifying and was cut from the 25-man squad for the group stage. In 2012, Gannon moved closer to the Shamrock Rovers first team, making 8 league appearances and playing in 7 cup games, where he was mostly deployed as a right-back. He was part of the Shamrock Rovers team that won the Leinster Senior Cup and scored three times for the club in cup competition. At the end of the season he was released by new manager Trevor Croly.

St Patrick's Athletic

Gannon signed for Liam Buckley at St Patrick's Athletic on 27 November 2012. He played 13 league games for St Pat's as they went on to win the 2013 League of Ireland Premier Division, featuring mostly as a central midfielder. Although Gannon was kept from playing in his favoured position by right-back Ger O'Brien, he later stated that he learned a lot from the experience of playing in the same team as him.

Dundalk

On 6 November 2013, Gannon…

As of match played on 11 September 2026

Gannon grew up in Ringsend and regularly attended Republic of Ireland matches with his father at the nearby Lansdowne Road. He was a ball boy in several games, most notably a 1–1 draw with Portugal in the 2002 World Cup qualifiers. In his teenage years, Gannon played for schoolboy clubs Cambridge Boys, Home Farm and St Kevin's Boys, before signing for Shamrock Rovers in the summer of 2010. He played in the club's A Championship team and was part of their under-20s title-winning side under Andrew Myler. While appearing for the Shamrock Rovers youth teams, Gannon successfully graduated from a joint FÁS/FAI Youth Soccer Training course in Irishtown Stadium, giving him exposure to a year of full-time training and preparing him for professional football.

Club

Shamrock Rovers League of Ireland Premier Division (4): 2011, 2021, 2022, 2023 President of Ireland's Cup (1): 2022 Leinster Senior Cup (1): 2012 St Patrick's Athletic League of Ireland Premier Division (1): 2013 Dundalk League of Ireland Premier Division (5): 2014, 2015, 2016, 2018, 2019 FAI Cup (3): 2015, 2018, 2020 League of Ireland Cup (3): 2014, 2017, 2019 President of Ireland's Cup (2): 2015, 2019 Leinster Senior Cup (1): 2015 Champions Cup (1): 2019 Shelbourne League of Ireland Premier Division (1): 2024

Individual

PFAI Team of the Year (6): 2014, 2015, 2016, 2017, 2018, 2019