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|Full name||Gary Patrick Breen|
|Date of birth||12 December 1973|
|Place of birth||Hendon, London, England|
|Height||6 ft 2 in (1.88 m)|
|Playing position(s)||Centre back|
|2002-2003||West Ham United||14||(0)|
|1996-2006||Republic of Ireland||63||(7)|
|* Senior club appearances and goals counted for the domestic league only|
Gary Patrick Breen (born 12 December 1973) is a former footballer who made more than 500 appearances in the Football League and Premier League. He played for numerous clubs over a 20-year career, including more than 100 appearances each for Coventry City and Sunderland. He won 63 caps for the Republic of Ireland, and played in the 2002 FIFA World Cup, scoring in Ireland's 3-0 victory over Saudi Arabia.
Breen was born in Hendon, London, and began his professional career as a youth player at Charlton Athletic, but never made a first-team appearance for the club. Instead, he moved to Maidstone United where he played his first league game at age 17. After one full season with the club he joined Gillingham where he eventually became a first-team regular, prompting a £70,000 bid from Peterborough United.
He only had one full season at Peterborough United, but did well enough to draw attention from First Division Birmingham City, who paid £250,000 for him in February 1996. Less than 12 months after arriving at Birmingham, he was on the move again, to Premier League Coventry City in a £2.5 million deal. He played for five full seasons at Highfield Road, four in the top flight.
Following the 2002 World Cup, Breen was signed on a free transfer by West Ham United by manager Glenn Roeder, but left the club after relegation from the top flight and only 18 appearances in all competitions. He was signed on a free transfer by his old Ireland manager Mick McCarthy for Sunderland.
Breen was subsequently signed by Wolverhampton Wanderers in a two-year deal, reuniting him again with McCarthy. He played almost all the club's games as they reached the play-offs in his first season at Molineux, scoring once, against Luton Town.
On the Goals on Sunday programme on 6 September 2009, Breen revealed that he had agreed to move to Inter Milan after the 2002 World Cup, but failed a medical. Breen had also been linked with a move to Barcelona. Breen left Barnet in June 2010.
Breen was appointed first-team coach of Peterborough United in June 2013.
Breen's form at Birmingham won him a call-up to the Republic of Ireland national football team. On 29 May 1996, he made his debut when he replaced Alan Kernaghan in the 88th minute of the 1-0 friendly defeat against Portugal at Lansdowne Road. Three days later, Breen made his first start in the 2-2 friendly draw with Croatia, he played 74 minutes before being replaced by Tony Cascarino. He scored his first goal for his country two days later, he opened the scoring in the 3-1 defeat to the Netherlands at De Kuip in Rotterdam.
Breen's form at Coventry cemented his place in his national side and he played at the 2002 FIFA World Cup as Ireland made the second round under Mick McCarthy. He scored in Ireland's 3-0 group win against Saudi Arabia.