Born and raised in Glasnevin, as a teenager Ó Ceallacháin played hurling with the amalgamated Dublin Colleges team.
[1] Ó Ceallacháin's performances in this competition resulted in his inclusion on Dublin's minor team in 2001.
[2] His club career with Na Fianna began at minor and under-21 levels before progressing to the senior team.
[3] Ó Ceallacháin coached at all levels with the Na Fianna club before taking over as senior team manager.
[6] Ó Ceallachaáin was ratified as manager of the Dublin senior hurling team on 10 September 2024.