*Club domestic league appearances and goals, correct as of 21:31, 27 February 2024 (UTC) ‡ National team caps and goals, correct as of 23:51, 27 September 2022 (UTC)
Lyons was an unused substitute in three league fixtures during the 2017 season.[7] He made his debut in senior football on 5 June 2018 in a 3–1 defeat away to Dundalk in the Leinster Senior Cup.[8]
Lyons scored the first goal of his senior career on 16 September 2019 in a 2–0 win over Crumlin United in the quarter-final of the FAI Cup at Richmond Park.[9] At the end of the 2020 season, he was named in the PFAI Team of the Year by his fellow professionals.[10] He signed a new one-year contract with the club on 25 January 2021.[5]
On 29 August 2022, it was announced that Lyons would join EFL Championship club Blackpool in January 2023 on a three-and-a-half-year deal, for a fee believed to be in the region of £300,000 plus add-ons.[16][17][18][19] He made his debut for the club on 7 January 2023, playing the full 90 minutes in a 4–1 win over Premier League side Nottingham Forest in the FA Cup.[20] He scored his first goal for the club on 7 February 2023 in a 2–2 draw with Huddersfield Town at Bloomfield Road.[21] In February 2024, Lyons suffered a serious knee injury, ruling him out for an extended period.[22]