Education
Horan was educated at Scoil Seanain Naofa(Clonlara National School), Saint Munchin"s College and Limerick Institute of Technology.
Horan was educated at Scoil Seanain Naofa(Clonlara National School), Saint Munchin"s College and Limerick Institute of Technology.
Horan made his debut in the 1999-1900 season, and was part of the winning team that saw crowned Europeans Champions in 2006. He managed to recover from a calf injury that he picked up in training six weeks prior to the final, and played a role in the final, where defeated Biarritz 23–19. He lost his place in the team to Wian du Preez but remained an important part of the team, frequently being sprung from the bench and occasionally starting.
A broken hand in October 2010 and an irregular heartbeat meant Horan was out for four months.
He became the seventh player to earn 200 caps for the club in a Pro 12 game against Ospreys on 3 December 2011. Horan agreed terms for a one-year contract extension with in March 2012.
On 11 April 2013, Horan announced his intention to retire from professional rugby at the end of the 2012-2013 season. His last game for was the Pro 12 fixture against Newport Gwent Dragons on 19 April 2013.
He lost his place to Reggie Corrigan during the 2003 Rugby World Cup and the 2004 and 2005 Six Nations Championship, but consistently strong performances for saw him regain his place in the team
He held down his place for the 2006, 2007, 2008 and 2009 Six Nations Championship, starting every match of "s victorious Grand Slam campaign. He was also an integral part of Eddie O"Sullivan"s 2007 Rugby World Cup squad. He missed the 2009 November Tests after having heart surgery, and lost his place to Cian Healy, who held on to the loosehead-prop position during the 2010 Six Nations Championship.
Horan played against the Barbarians F.C. and New Zealand Maori during "s 2010 Summer Tests, but was ruled out of the 2010 November Tests with a broken hand.
He missed the 2011 Six Nations Championship, but was selected in "s training squad for the 2011 Rugby World Cup warm-ups in August 2011. He played against Scotland, but missed out on selection in the final squad for the World Cup.