All widely recognised sovereign states located entirely within Europe are members, with the exceptions of the United Kingdom, Monaco and Vatican City. Eight states partially or entirely outside Europe are also members: Armenia, Azerbaijan, Russia, Georgia, Kazakhstan, Israel, Cyprus and Turkey. The United Kingdom is divided into the four separate football associations of England, Northern Ireland, Scotland, and Wales; each association has a separate UEFA membership. The Faroe Islands, an autonomous country of the Kingdom of Denmark, also has its own football association which is a member of UEFA. The football association of Gibraltar, a British Overseas Territory, was approved as a member by UEFA in 2013.Kosovo was approved as a member in 2016, even though it is claimed by Serbia and is not recognised by several other UEFA member states.
Each UEFA member has its own football league system, except Liechtenstein. Clubs playing in each top-level league compete for the title as the country's club champions. Clubs also compete in the league and national cup competitions for places in the following season's UEFA club competitions, the UEFA Champions League and UEFA Europa League. Due to promotion and relegation, the clubs playing in the top-level league are different every season, except in San Marino where there is only one level.
The UEFA league coefficients, also known as the UEFA rankings, are used to rank the leagues of Europe, and thus determine the number of clubs from a league that will participate in UEFA Champions League and UEFA Europa League. A country's ranking determines the number of teams competing in the season after the next; the 2009 rankings determined qualification for European competitions in the 2010–11 season.
A country's ranking is calculated based on the results of its clubs in UEFA competitions over the past five seasons. Two points are awarded for each win by a club, and one for a draw. If a game goes to extra time, the result at the end of time is used to calculate ranking points; if the match goes to a penalty shootout, it is considered to be a draw for the purposes of the coefficient system. The number of points awarded to a country's clubs are added together, and then divided by the number of clubs that participated in European competitions that season. This number is then rounded to three decimal places; two and two-thirds would become 2.667.
For the league coefficient the season's league coefficients for the last five seasons must be added up. In the preliminary rounds of both the Champions League and Europa League, the awarded points are halved. Bonus points for certain achievements are added to the number of points scored in a season. Bonus points are allocated for:
Qualifying for the Champions League group phase. (4 bonus points)
Reaching the second round of the Champions League. (5 bonus points)
Reaching the quarter, semi and final of both Champions League and Europa League. (1 bonus point)