Celtic play home games at Celtic Park commonly referred to as Parkhead, which has a capacity of 60,832, and is currently the second largest club stadium in the United Kingdom. In 2005-06, Celtic Park attracted an average attendance of 58,149, making the club third after Manchester United and Arsenal in average attendance for any football club in the UK.
Together with their rivals, Rangers FC, they form the Old Firm which is one of the most famous and fiercest rivalries in sport. Celtic has historically and traditionally been synonymous with its founding roots which stemmed from the Irish Catholic immigrant community in Glasgow.
In 1967, Celtic became the first British team to win the European Champions Cup, which had previously been the preserve of Italian, Portuguese and Spanish clubs. Celtic won every competition that they entered that season: the Scottish League, the Scottish Cup, the Scottish League Cup, the European Cup and the Glasgow Cup.
Additionally, Celtic remain the only Scottish club ever to have reached the final, and are the only club ever to win the trophy with a team composed entirely of home-grown talent; as all of the players in the side were Scottish, and all were born within a 30-mile radius of Celtic Park. Celtic again reached the European Cup final in 1970, only to be beaten by Feyenoord in extra time. In 2003 Martin O'Neill led the team to the UEFA Cup final in Seville where they lost 3-2 to FC Porto after extra time. Around 80,000 Celtic supporters travelled to Seville for the final.
The club's traditional kit colours are green and white hooped shirts and white shorts with white socks. Celtic are one of the best-supported clubs in the world, with an estimated fanbase of approximately nine million.
Celtic won the Scottish Premier League and Scottish Cup in 2006-07 season.