[6] On 28 September 2018, he was part of the side that won the 2017–18 Leinster Senior Cup by defeating rivals St Patrick's Athletic on penalties after a 1–1 draw following extra time, with Rooney scoring in the shootout.
[9] On 1 October 2021, he was part of the team that defeated Treaty United 1–0 at Tolka Park to claim the 2021 League of Ireland First Division title to yo-yo the club back up to the Premier Division in what proved to be the final of his 110 appearances for the club, in which he scored 19 goals during his 5 seasons at senior level.
[10] Rooney signed for League of Ireland Premier Division club Drogheda United on 6 December 2021, ahead of the 2022 season.
[18][19] His first goal for the club came on 15 March 2024, when he opened the scoring in a 2–1 win over Derry City at Dalymount Park.
[20] On 19 July 2024, he scored the only goal of the game in the Dublin derby as his penalty knocked Shamrock Rovers out of the FAI Cup.