Career
He has also played for the Republic of Ireland national football team at Under 19 and Under 21 levels. Celtic
O'Connell made his Scottish Premiership debut for Celtic against Ross County on 29 March 2014. = Loan moves O'Connell signed for Oldham Athletic on 1 September 2015, on a loan which expired on 1 January 2016.
O'Connell made his Oldham debut against Bradford on 5 September and impressed playing as a right-back. After playing a further match, O'Connell picked up an injury in training and didn't play for Oldham again. He returned to Celtic in November.
In February 2016, O'Connell moved out on loan again, this time to his home-town club, League of Ireland side Cork City. O'Connell made his Republic of Ireland U19 debut against Norway in August 2013.