UEFA Champions League
Qualification

The UEFA Champions League used to begin with a double round-robin group stage of 32 teams until it evolved into a league stage of 36 teams, which is preceded by two qualification 'streams' for teams that do not receive direct entry to the tournament proper. The two streams are divided between teams qualified by virtue of being league champions, and those qualified by virtue of finishing second, third or fourth in their national championship.

The number of teams that each association enters into the UEFA Champions League is based upon the UEFA coefficients of the member associations. These coefficients are generated by the results of clubs representing each association during the previous five Champions League, Europa League and Conference League seasons. The higher an association's coefficient, the more teams represent the association in the Champions League, and the fewer qualification rounds the association's teams must compete in.

Five of the remaining seven qualifying places are granted to the winners of a four-round qualifying tournament between the remaining 43 or 44 national champions, within which those champions from associations with higher coefficients receive byes to later rounds. The other two are granted to the winners of a three-round qualifying tournament between ten and eleven clubs from the associations ranked 5–6 through 15, which have qualified based upon finishing second, third or fourth in their respective national league.

In addition to sporting criteria, any club must be licensed by its national association to participate in the Champions League. To obtain a license, the club must meet certain stadium, infrastructure and finance requirements.

In 2005–06, Liverpool and Artmedia Bratislava became the first teams to reach the Champions League group stage after playing in all three qualifying rounds. Real Madrid and Barcelona hold the record for the most appearances in the group stage, having qualified 25 times, followed by Porto and Bayern Munich on 24.

Between 1999 and 2008, no differentiation was made between champions and non-champions in qualification. The 16 top-ranked teams spread across the biggest domestic leagues qualified directly for the tournament group stage. Prior to this, three preliminary knockout qualifying rounds whittled down the remaining teams, with teams starting in different rounds.

An exception to the usual European qualification system happened in 2005, after Liverpool won the Champions League the year before, but did not finish in a Champions League qualification place in the Premier League that season. UEFA gave special dispensation for Liverpool to enter the Champions League, giving England five qualifiers. UEFA subsequently ruled that the defending champions qualify for the competition the following year regardless of their domestic league placing. However, for those leagues with four entrants in the Champions League, this meant that, if the Champions League winner fell outside of its domestic league's top four, it would qualify at the expense of the fourth-placed team in the league. Until 2015–16, no association could have more than four entrants in the Champions League. In May 2012, Tottenham Hotspur finished fourth in the 2011–12 Premier League, two places ahead of Chelsea, but failed to qualify for the 2012–13 Champions League, after Chelsea won the 2012 final. Tottenham were demoted to the 2012–13 UEFA Europa League.

In May 2013, it was decided that, starting from the 2015–16 season (and continuing at least for the three-year cycle until the 2017–18 season), the winners of the previous season's UEFA Europa League would qualify for the UEFA Champions League, entering at least the play-off round, and entering the group stage if the berth reserved for the Champions League title holders was not used. The previous limit of a maximum of four teams per association was increased to five, meaning that a fourth-placed team from one of the top three ranked associations would only have to be moved to the Europa League if both the Champions League and Europa League winners came from that association and both finished outside the top four of their domestic league.

In 2007, Michel Platini, the UEFA president, had proposed taking one place from the three leagues with four entrants and allocating it to that nation's cup winners. This proposal was rejected in a vote at a UEFA Strategy Council meeting. In the same meeting, however, it was agreed that the third-placed team in the top three leagues would receive automatic qualification for the group stage, rather than entry into the third qualifying round, while the fourth-placed team would enter the play-off round for non-champions, guaranteeing an opponent from one of the top 15 leagues in Europe. This was part of Platini's plan to increase the number of teams qualifying directly into the group stage, while simultaneously increasing the number of teams from lower-ranked nations in the group stage.

In 2012, Arsène Wenger referred to qualifying for the Champions League by finishing in the top four places in the Premier League as the "4th Place Trophy". The phrase was coined after a pre-match conference when he was questioned about Arsenal's lack of a trophy after exiting the FA Cup. He said "The first trophy is to finish in the top four". At Arsenal's 2012 AGM, Wenger was also quoted as saying: "For me there are five trophies every season: Premier League, Champions League, the third is to qualify for the Champions League..."
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