AFC Champions League

The competition started as the Asian Champion Club Tournament, a tournament for the champions of AFC nations, and had a variety of different formats, with the inaugural tournament staged as a straight knock-out format and the following three editions consisting of a group stage.

While Israeli clubs dominated the first four editions of the competition, this was partly due to the refusal of Arab clubs to play them:

• In 1970, Lebanese club Homenetmen refused to play Hapoel Tel Aviv in the semi-final, which was scratched with Hapoel advancing to the final.
• In 1971, Aliyat Al-Shorta of Iraq refused to play Maccabi Tel Aviv on three occasions: in the preliminary round (which was redrawn), in the group stage, and in the final, which was scratched with Maccabi being awarded the championship.[2] During the award ceremony for Maccabi, Aliyat Al-Shorta players waved the Palestinian flag around the field, while the Iraqi media considered Aliyat Al-Shorta as the tournament's winners, with the team holding an open top bus parade in Baghdad.[3]

After the 1972 edition had to be cancelled by the AFC for various reasons, including two Arab clubs being excluded for refusing to commit to playing against Israeli club Maccabi Netanya, the AFC suspended the competition for 14 years, while Israel would be expelled from the AFC in 1974.

Asia's premier club tournament made its return in 1985 as the Asian Club Championship.[4]

In 1990, the Asian Football Confederation introduced the Asian Cup Winners' Cup, a tournament for the cup winners of each AFC nation, while the 1995 season saw the introduction of the Asian Super Cup, with the winners of the Asian Club Championship and Asian Cup Winners' Cup playing against each other.

Japan's Kashima Antlers and Singapore's Warriors FC during a group stage game during the 2009 season at the Jalan Besar Stadium.

The 2002–03 season saw the Asian Club Championship, Asian Cup Winners' Cup and Asian Super Cup combine to become the AFC Champions League. League champions and cup winners would qualify for the qualifying playoffs with the best eight clubs from East Asia and the eight best clubs from West Asia progressing to the group stage. The first winners under the AFC Champions League name were Al-Ain, defeating BEC Tero Sasana 2–1 on aggregate. In 2004, 29 clubs from fourteen countries participated and the tournament schedule was changed to March–November.

In the group stage, the 28 clubs were divided into seven groups of four on a regional basis, separating East Asian and West Asian clubs to reduce travel costs, and the groups were played on a home and away basis. The seven group winners along with the defending champions qualified to the quarter-finals. The quarter-finals, semi-finals, and finals were played as a two-legged format, with away goals, extra time, and penalties used as tie-breakers.

The 2005 season saw Syrian clubs join the competition, thus increasing the number of participating countries to 15, and two years later, following their transfer into the AFC in 2006, Australian clubs were also included in the tournament. However, many blamed the low prize money at that time and expensive travel cost as some of the reasons. The Champions League was expanded to 32 clubs in 2009 with direct entry to the top ten Asian leagues. Each country received up to 4 slots, though no more than one-third of the number of teams in that country's top division, rounded downwards, depending on the strength of their league, professional league structure, marketability, financial status, as well as other criteria set by the AFC Pro-League Committee.[5] The assessment criteria and ranking for participating associations are revised by AFC every two years.[6]

FIFA president Gianni Infantino and around 100,000 others watching the 2018 AFC Champions League Final at Azadi Stadium.

The old format saw the eight group winners and eight runners-up qualify to the round of 16, in which group winners played host to the runners-up in two-legged series, matched regionally, with away goals, extra time, and penalties used as tie-breakers. The regional restriction continues all the way until the final, although clubs from the same country couldn't face each other in the quarterfinals unless that country has three or more representatives in the quarterfinals. Since 2013, the final has also been held as a two-legged series, on a home and away basis.[7][8]

In 2021, the group stage was expanded from 32 to 40 teams, with both the West and East Regions having five groups of four teams. The slot allocation for the top six member associations in each region remained unchanged. The 10 group winners and top 3 runners-up per region are now seeded based on a combination table for the round of 16, with the games still matched regionally until the final.[9]

On 25 February 2022, it was announced that the AFC Champions League would go back to an inter-year (autumn to spring) schedule starting with the 2023–24 season. In addition, the existing "3+1" rule for foreign players during matches (3 foreign players and 1 Asian foreigner) was expanded to "5+1" (5 foreign players and 1 Asian foreigner).[10]

On 23 December 2022, it was announced that the AFC competition structure would change from the established formats. Under the new plans, the top club competition of Asian football will only consist of 24 teams, divided into East and West regions (12 teams each), with each team playing eight other teams from their region (four teams at home and four teams away) in the brand-new league stage, which replaces the usual group stage. The top eight teams per region will advance to the knockout stage, where only the round of 16 will be played over two legs, and from the quarter-finals onward the matches will be held at a neutral venue.[11] On 14 August 2023, it was confirmed that the new format would come into effect from the 2024–25 season onwards. In addition, the name of Asia's top-tier competition was changed to AFC Champions League Elite.[12]

By 2021, the various problems with the Iranian sides were attracting media attention; international Arabic and English-language media reported the violation of women's rights in the stadiums of Iranian sides.

On top of that, Iranian women were banned from football stadiums for about 40 years, by the Iranian government.[13][14] In 2019, Iranian women were first allowed to watch football at stadiums, but not during ACL games.[14][15] Before that, FIFA had pressured Iran to let women into the stadiums; Iran relented, but capped the number of women to watch the 2018 final.[14][16] In 2021, the AFC investigated the matter, in the hope of allowing unrestricted attendance whenever Iranian clubs are involved.[17]

Map of AFC countries whose teams reached the group stage of the AFC Champions League

  AFC member country that has been represented in the group stage

  AFC member country that has not been represented in the group stage

As of the 2021 edition of the tournament, the AFC Champions League has commenced with a double round-robin group stage of 40 teams, which is preceded by qualifying matches for teams that do not receive direct entry to the competition proper. Teams are also split into east and west zones to progress separately in the tournament.

The number of teams that each association enters into the AFC Champions League is determined annually through criteria as set by the AFC Competitions Committee.[18] The criteria, which is a modified version of the UEFA coefficient, measures such thing as marketability and stadia to determine the specific number of berths that an association receives. The higher an association's ranking as determined by the criteria, the more teams represent the association in the Champions League, and the fewer qualification rounds the association's teams must compete in.

The tournament proper begins with a group stage of 40 teams, divided into ten groups. Seeding is used whilst making the draw for this stage, with teams from the same country not being drawn into groups together. The group stage is divided into two zones; the first zone is the five East Asian groups and the other zone is the five West Asian groups. Each team meets the others in its group home and away in a round-robin format. The winning team from each group (five in each zone) and the six best runners-up (three from each zone) then progress to the next round.

For this stage, three group winners plays against the three best runners-up from another group from their zone of the group stage while the other two group winners from each zone play against each other. The tournament uses the away goals rule: if the aggregate score of the two games is tied after 180 minutes, then the team who scored more goals at their opponent's stadium advances. If still tied the clubs play extra time, where the away goals rule is no longer applied. If still tied after extra time, the tie shall be decided by a penalty shootout. Winners of each tie advance to the next round, with the East and West zones continue to be kept part until the final.[18]

The group stage and round of 16 matches are played through the first half of the year (February–May), whilst the knock-out stage thereafter is played during the second half of the year (August–November). The knock-out ties are played in a two-legged format, including the final.

Teams from 24 AFC countries have reached the group stage of the AFC Champions League. The allocation of teams by member countries is listed below; asterisks represent occasions where at least one team was eliminated in qualification prior to the group stage. 32 AFC countries have had teams participate in qualification, and countries that have never had teams reach the group stage are not shown.

Associations	Entrants
	2002–03	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023–24
East Asia
Australia	Part of OFC				2	2	2	2	2	3	1*	3	2*	2*	3	2*	2*	3	0	2*	1
China PR	2	2	2	2	2	2	4	4	4	3	4	4	4	4	3*	4	4	4	2*	2	3*
Hong Kong	0*	0	0	0	0	0	0	0	0	0	0	0*	0*	0*	1*	1*	0*	0*	1	1	1*
Indonesia	0*	2	2	0	2	0	1*	1*	1*	0*	0	0	0*	0	0	0*	0*	0*	0	0	0
Japan	2	2	2	2	2	3	4	4	4	4	4	4	4	4	4	4	4	3*	4	4	4
South Korea	2	2	2	2	3	2	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Malaysia	0	0	0	0	0	0	0	0	0	0	0	0	0*	0*	0*	0*	1*	1*	1	1	1
Philippines	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0*	0*	0*	0*	2	1*	1
Singapore	0*	0	0	0	0	0	1	1	0	0	0	0*	0*	0*	0*	0*	0*	0*	1	1	1
Thailand	2	2	2	0	1	2	0*	0*	0*	1*	2	1*	1*	1*	1*	1*	1*	1*	4	2*	3*
Vietnam	0*	2	2	2	1	2	0	0*	0	0	0	0*	1*	1*	0*	0*	0*	0*	1	1	1*
Total	8	12	12	8	13	13	16	16	15	15	15	16	16	16	16	16	16	16	20	19	20
West Asia
Bahrain	0*	2	0	0	0	0	0	0	0	0	0	0*	0*	0	0	0*	0	0*	0*	0	0
India	0*	0	0	0	0	0	0*	0*	0*	0	0	0*	0*	0*	0*	0*	0*	0*	1	1	1
Iran	2	2	2	2	1	2	4	4	4	3*	3*	4	4	3*	4	4	3*	4	4	2	3*
Iraq	1*	2	2	2	2	2	0	0	0	0	0	0*	0	0	0	0	1*	1*	2*	1*	1
Jordan	0*	0	0	0	0	0	0	0	0	0	0	0*	0*	0*	0*	0*	0*	0*	1	1	1*
Kuwait	0*	1	2	2	2	2	0	0	0	0	0	0*	0*	0	0	0	0*	0*	0*	0	0
Qatar	1*	2	2	2	2	2	2	2	3	4	4	4	2*	2*	2*	4	3*	2*	3*	4	2*
Saudi Arabia	1*	2	3	3	2	2	4	4	4	3*	4	4	4	4	4	2	4	4	3*	4	4
Syria	0*	0	2	2	2	2	0	0*	0*	0	0	0	0	0	0	0	0	0	0	0*	0
Tajikistan	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0*	0*	1	1	1
Turkmenistan	1*	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1
United Arab Emirates	1*	3	2	2	2	2	4	4	4	4	4	3*	2*	3*	4	4	3*	4	3*	3*	2*
Uzbekistan	1*	2	2	2	2	2	2	2	2	3*	2*	1*	4	4	2*	2*	2*	1*	2	2	4
Total	8	14	17	17	15	16	16	16	17	17	17	16	16	16	16	16	16	16	20	20	20
Total
Finals	16	26	29	25	28	29	32	32	32	32	32	32	32	32	32	32	32	32	40	39	40
Qualifying	53	26	29	25	28	29	35	37	36	37	35	47	49	45	47	46	51	52	45	46	53

Like the FIFA World Cup, the AFC Champions League is sponsored by a group of multinational corporations, in contrast to the single main sponsor typically found in national top-flight leagues.

The tournament's current main sponsors are:

• Neom[20]
• Konami[21]
• Molten[22]

Performances in the Asian Club Championship and AFC Champions League by club

Club	Title(s)	Runners-up	Seasons won	Seasons runner-up
Al-Hilal	4	5	1991, 1999–2000, 2019, 2021	1986, 1987, 2014, 2017, 2022
Pohang Steelers	3	1	1996–97, 1997–98, 2009	2021
Urawa Red Diamonds	3	1	2007, 2017, 2022	2019
Esteghlal	2	2	1970, 1990–91	1991, 1998–99
Seongnam FC	2	2	1995, 2010	1996–97, 2004
Al-Ittihad	2	1	2004, 2005	2009
Jeonbuk Hyundai Motors	2	1	2006, 2016	2011
Maccabi Tel Aviv1	2	0	1969, 1971	—
Al-Sadd	2	0	1988–89, 2011	—
Thai Farmers Bank2	2	0	1993–94, 1994–95	—
Suwon Samsung Bluewings	2	0	2000–01, 2001–02	—
Ulsan Hyundai	2	0	2012, 2020	—
Guangzhou	2	0	2013, 2015	—
Júbilo Iwata	1	2	1998–99	1999–2000, 2000–01
Al-Ain	1	2	2002–03	2005, 2016
Hapoel Tel Aviv1	1	1	1967	1970
Liaoning2	1	1	1989–90	1990–91
Busan IPark	1	0	1985–86	—
JEF United Chiba	1	0	1986	—
Tokyo Verdy	1	0	1987	—
PAS Tehran2	1	0	1992–93	—
Gamba Osaka	1	0	2008	—
Western Sydney Wanderers	1	0	2014	—
Kashima Antlers	1	0	2018	—
Al-Ahli	0	2	—	1985–86, 2012
FC Seoul	0	2	—	2001–02, 2013
Persepolis	0	2	—	2018, 2020
Selangor	0	1	—	1967
Yangzee2	0	1	—	1969
Aliyat Al-Shorta	0	1	—	1971
Al-Rasheed2	0	1	—	1988–89
Yokohama F. Marinos	0	1	—	1989–90
Al-Shabab	0	1	—	1992–93
Oman Club	0	1	—	1993–94
Al-Arabi	0	1	—	1994–95
Al-Nassr	0	1	—	1995
Dalian Shide2	0	1	—	1997–98
Police Tero	0	1	—	2002–03
Al-Karamah	0	1	—	2006
Sepahan	0	1	—	2007
Adelaide United	0	1	—	2008
Zob Ahan	0	1	—	2010
Shabab Al-Ahli	0	1	—	2015

¹ In 1974, the Israel Football Association was expelled from the Asian Football Confederation due to political pressure, and became a full UEFA member in 1994. As a result, Israeli clubs no longer participate in AFC tournaments but in their UEFA counterparts instead.
² Teams that no longer exist.

Note: Israeli clubs, winners of the 1967, 1969 and 1971 editions, are not included.