During the second half of the 2013 season, he formed a formidable partnership with Andy Boyle at the heart of the defence, and was a key player in Dundalk's title challenge – playing 12 matches and scoring twice.

[11] Gartland picked up a serious injury to his Anterior cruciate ligament on 2 April 2021, 6 minutes into his first league appearance of the season, against Shamrock Rovers at Tallaght Stadium.

[12] After retiring from playing at the end of the 2022 season with Dundalk, Gartland remained with the club in the role of Head of Football Operations from January 2023 until he was sacked in May 2024.

[13] During his spell as Head of Football Operations, from April–May 2024, after the sacking of Stephen O'Donnell, he acted as co-interim manager of the first-team alongside Liam Burns.

[14] In January 2025, Gartland was awarded a sum of €64,434 compensation by Dundalk after a successful unfair dismissal claim in the Workplace Relations Commission.