2008 AFC Champions League
| Tournament details | |
|---|---|
| Dates | 12 March - 12 November 2008 |
| Teams | 29 |
| Final positions | |
| Champions |
 Gamba Osaka (1st title)
|
| Runners-up |
 Adelaide United
|
| Tournament statistics | |
| Matches played | 98 |
| Goals scored | 275 (2.81 per match) |
| Top scorer(s) |
 Nantawat Thansopa(9 goals) |
| Best player |
Yasuhito Endō
|
The 2008 AFC Champions League was the 27th AFC Champions League, the top-level Asian club football tournament, and the 6th under the current AFC Champions League title. It was the last AFC Champions League before the competition expanded to 32 teams.
Along with the defending champion, Urawa Red Diamonds, 28 other clubs from fourteen countries qualified based on performance in domestic league and cup competitions. Urawa Red Diamonds entered the competition at the quarter-finals. The draw for group stage took place on 12 December 2007.
† In the 2008 edition, Indonesia were allocated two slots just like the older editions. However, on 12 December 2007, AFC awarded one Indonesian slots to Thailand and the other one to Vietnam, due to delay in Indonesian domestic league and cup tournament, allowing both Thai and Vietnamese slots to be total of two.
A total of 28 clubs were divided into seven groups of four, based on region, i.e. East Asian and Southeast Asian clubs were drawn in groups E to G, while the rest were grouped in groups A to D. Each club played double round-robin (home and away) against the other three teams in their group, a total of 6 matches each. Clubs received three points for a win, one point for a draw and no points for a loss. The clubs were ranked according to points and tie breakers were in the following order:
The seven group winners and the defending champion advanced to the quarter-finals.
All eight clubs were randomly paired together, with the restriction that clubs from the same country could not face each other in the quarter-finals. The games were played over two legs, home and away; the team with the higher aggregate score was declared the match winner. If the aggregate score could not produce a winner, "away goals rule" was used. If the two teams were still tied, extra time was played, at the end of which the "away goals rule" was again applied if the scores were tied. If still tied, the game would go to penalties.
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