• Position: Defender
• Number: 15
• Age: 38 (9th February, 1987)

O'Cearuill started his career at Leyton Orient, playing 27 youth team games in 2004-05 before being released in August 2005.

He then joined Watford and played for their youth and reserve teams for a season, but was released in the summer of 2006.

He was promptly signed by Arsenal after a successful trial, having impressed Arsenal's reserve team coach Neil Banfield in their game against Watford.

On 4 January 2007, O'Cearuill joined League One side Brighton on loan, initially for one month.

Although born in England, O'Cearuill has elected to represent the Republic of Ireland at international level and has played for that country's U-17 and U-19 teams.

O'Cearuill was called up the Republic of Ireland senior squad for the first time in May 2007 for an end of season tour to the United States, without having played for the Republic of Ireland under-21 national football team.

He moved to Barnet in August 2007. Since joining Barnet, he did not play for the Republic of Ireland national football team but was called up by Don Givens to the Republic of Ireland under-21 national football team, making his debut in an away game against Montenegro.

In January 2008 O'Cearuill joined St Patrick's Athletic.

Previous Clubs: Barnet, Leyton Orient, Arsenal, Watford