Background
O'Halloran was born in Cobh and played for local side Springfield A.F.C., before joining Aston Villa.
O'Halloran was born in Cobh and played for local side Springfield A.F.C., before joining Aston Villa.
He began his professional career in the Premier League with Aston Villa and has earned two full international caps for the Republic of Ireland. Following two serious cruciate ligament injuries during his time at Villa Park, O'Halloran moved on to Coventry City in 2010 and currently plays for Salford City. Aston Villa
He broke into the Villa squad for their 2006–07 pre-season friendlies but did not make any first team appearances.
In 2007 O'Halloran signed a new contract with Aston Villa, keeping him at the club until 2009. However, at the beginning of the 2009–10 season O'Halloran was omitted from the press release announcing Villa's squad numbers. O'Halloran's number 29 shirt was given to Welsh international defender James Collins upon his signing for the club.
O'Halloran returned for the reserves, in the national play-off final against Manchester United. = Wycombe Wanderers The young left-sided defender was loaned out to Wycombe Wanderers in October 2006, and played a pivotal role in guiding them to the semi-finals of the Football League Cup. However, his loan spell ran out before the second-leg, and Wycombe eventually lost 5–1 to Chelsea.
= Southampton On 16 January 2008, he signed for Southampton on loan until February 2008, making only one substitute appearance. = Leeds United On 28 February he signed for Leeds United on an initial one-month loan deal. In the warm up for what would have been his debut for Leeds against Swindon Town at the County Ground, he suffered a serious anterior cruciate ligament injury which kept him out for up to a year.
He was replaced in the starting line-up by Frazer Richardson. After suffering the injury he returned to Aston Villa for treatment. = Swansea City On 5 November O'Halloran signed for Swansea City on an initial three-month loan deal as competition to Argentinian-born left back Federico Bessone.
The 21-year-old was signed to fill the gap left by fellow Irish defender Marcos Painter, who was out for the majority of the season through injury. O'Halloran was the victim of yet another cruciate ligament injury in his spell at Swansea, which caused him to terminate his loan on 25 December 2008. O'Halloran did not rule out a future spell at Swansea, claiming that he "may return one day to have another crack".
Coventry City
O'Halloran signed a one-year deal with Coventry City on 23 June 2010 and was new manager Aidy Boothroyd's second signing of the close season. Carlisle United
On 24 June 2011, during a trial at the club, O'Halloran signed a one-year deal with Carlisle United, the contract will be officially signed on 1 August 2011. He was given number 29 jersey at the club.
Nuneaton Town
After a brief trial, O'Halloran signed a one-year deal at Conference Premier team Nuneaton Town. He was given the number 21 jersey at the club. Stockport County
In June 2013 O'Halloran joined Stockport Country.
Salford City
In May 2015 he signed for Salford City. On 16 May 2007, O'Halloran was named in Steve Staunton's Republic of Ireland squad and played in the friendlies against Ecuador and Bolivia, despite not having played a single first team game for Aston Villa. O'Halloran has also represented his country at U15, U16, U17 and U21 level.
He is studying for a degree in Physiotherapy at the University of Salford.