Mark played with Drogheda United's U19 squad in the 2015, 2016 and 2017 seasons. He was added to Pete Mahon's senior squad ahead of the 2016 First Division campaign and made his league debut on the opening night of the 2016 season in a 2-1 win over Waterford United at United Park. He made 6 league appearances that season and was again part of Drogheda's first team squad in 2017. In 2017, Mark made 16 appearances and scored twice for the Drogs as they were relegated from the Premier Division. Mark re-signed with Drogheda before the 2018 season. Mark scored 9 goals during 2018 as Drogheda reached the play-offs. He then re-signed for the 2019 season.