A total of 16 teams, 8 from West Asia and 8 from East Asia, competed in the 2011 AFC Champions League knockout stage. They included the 8 group winners and the 8 group runners-up from the group stage.
Each round of this single-elimination tournament was played over one or two matches. In the round of 16, each tie was played in one match, hosted by the winners of each group against the runners-up of another group. In the quarter-finals and semi-finals, each tie was played over two legs on a home-and-away basis. The final was hosted by one of the finalists, decided by draw. The away goals rule (for two-legged ties), extra time (away goals do not apply in extra time) and penalty shootout would be used to decide the winner if necessary. [1]
The matchups for the round of 16 were decided prior to the group stage draw. [2] After the completion of the round of 16, the draw for the quarter-finals, semi-finals, and final was held in Kuala Lumpur, Malaysia on 7 June 2011. [3] In this draw, the "country protection" rule was applied: if there are exactly two clubs from the same country, they may not face each other in the quarter-finals; however, if there are more than two clubs from the same country, they may face each other in the quarter-finals.
While the bracket below shows the entire knockout stage, the draw for the round of 16 matches was determined at the time of the group draw, and kept teams from East and West Asia completely separate for that round.
The draw for the quarter-finals and beyond was held separately, after the conclusion of the round of 16.
| Round of 16 | Quarter-finals | Semi-finals | Final | ||||||||||||||||
 Al-Ittihad | 3 | ||||||||||||||||||
| Al-Hilal | 1 | ||||||||||||||||||
| Al-Ittihad | 3 | 0 | 3 | ||||||||||||||||
 FC Seoul | 1 | 1 | 2 | ||||||||||||||||
| FC Seoul | 3 | ||||||||||||||||||
 Kashima Antlers | 0 | ||||||||||||||||||
| Al-Ittihad | 2 | 1 | 3 | ||||||||||||||||
| Jeonbuk Hyundai Motors | 3 | 2 | 5 | ||||||||||||||||
| Gamba Osaka | 0 | ||||||||||||||||||
| Cerezo Osaka | 1 | ||||||||||||||||||
| Cerezo Osaka | 4 | 1 | 5 | ||||||||||||||||
| Jeonbuk Hyundai Motors | 3 | 6 | 9 | ||||||||||||||||
| Jeonbuk Hyundai Motors | 3 | ||||||||||||||||||
 Tianjin Teda | 0 | ||||||||||||||||||
| Jeonbuk Hyundai Motors | 2 (2) | ||||||||||||||||||
 Al-Sadd (p) | 2 (4) | ||||||||||||||||||
| Suwon Samsung Bluewings | 2 | ||||||||||||||||||
| Nagoya Grampus | 0 | ||||||||||||||||||
| Suwon Samsung Bluewings (a.e.t.) | 1 | 2 | 3 | ||||||||||||||||
 Zob Ahan | 1 | 1 | 2 | ||||||||||||||||
| Zob Ahan | 4 | ||||||||||||||||||
| Al-Nassr | 1 | ||||||||||||||||||
| Suwon Samsung Bluewings | 0 | 1 | 1 | ||||||||||||||||
| Al-Sadd | 2 | 0 | 2 | ||||||||||||||||
| Sepahan | 3 | ||||||||||||||||||
 Bunyodkor | 1 | ||||||||||||||||||
| Sepahan | 0 | 2 | 2 | ||||||||||||||||
| Al-Sadd [A] | 3 | 1 | 4 | ||||||||||||||||
| Al-Sadd | 1 | ||||||||||||||||||
| Al-Shabab | 0 | ||||||||||||||||||
The matches were played 24–25 May 2011. [4] [5]
| Team 1 | Score | Team 2 |
|---|---|---|
| Sepahan | 3–1 | Bunyodkor |
| Al-Ittihad | 3–1 | Al-Hilal |
| Al-Sadd | 1–0 | Al-Shabab |
| Zob Ahan | 4–1 | Al-Nassr |
| Team 1 | Score | Team 2 |
|---|---|---|
| Gamba Osaka | 0–1 | Cerezo Osaka |
| Jeonbuk Hyundai Motors | 3–0 | Tianjin Teda |
| FC Seoul | 3–0 | Kashima Antlers |
| Suwon Samsung Bluewings | 2–0 | Nagoya Grampus |
| Jeonbuk Hyundai Motors | 3 – 0 | Tianjin Teda |
|---|---|---|
Eninho  32', 84'Lee Seung-Hyun 43' | Report |
| Gamba Osaka | 0 – 1 | Cerezo Osaka |
|---|---|---|
| Report | Takahashi 88' |
| Al-Ittihad | 3 – 1 | Al-Hilal |
|---|---|---|
| Nuno Assis 15', 59' Ziaya 17' | Report | Al-Dosari 82' |
| Suwon Samsung Bluewings | 2 – 0 | Nagoya Grampus |
|---|---|---|
| Yeom Ki-Hun 23' Lee Sang-ho 57' | Report |
| FC Seoul | 3 – 0 | Kashima Antlers |
|---|---|---|
| Bang Seung-Hwan 38' Damjanović 55'Ko Myong-Jin 90+2' | Report |
The first legs were played 14 September 2011, and the second legs were played 27–28 September 2011. [4]
| Team 1 | Agg. | Team 2 | 1st leg | 2nd leg |
|---|---|---|---|---|
| Cerezo Osaka | 5–9 | Jeonbuk Hyundai Motors | 4–3 | 1–6 |
| Al-Ittihad | 3–2 | FC Seoul | 3–1 | 0–1 |
| Sepahan | 2–4 | Al-Sadd | 0–3 [A] | 2–1 |
| Suwon Samsung Bluewings | 3–2 | Zob Ahan | 1–1 | 2–1 (aet) |
| Cerezo Osaka | 4 – 3 | Jeonbuk Hyundai Motors |
|---|---|---|
| Bando 29' Kiyotake 56', 81'Kim Bo-Kyung 64' (pen.) | Report | Lee Dong-Gook 6', 45+1' Cho Sung-Hwan 58' |
| Suwon Samsung Bluewings | 1 – 1 | Zob Ahan |
|---|---|---|
| Park Hyun-Beom 66' | Report | Ghazi 57' |
| Al-Ittihad | 3 – 1 | FC Seoul |
|---|---|---|
| Noor 45' Al-Muwallad 76'Wendel 90+2' | Report | Choi Tae-Uk 83' |
| Jeonbuk Hyundai Motors | 6 – 1 | Cerezo Osaka |
|---|---|---|
| Eninho 31' Lee Dong-Gook 49', 55', 64', 90+1'Kim Dong-Chan 76' | Report | Komatsu 72' |
Jeonbuk Hyundai Motors won 9–5 on aggregate.
| FC Seoul | 1 – 0 | Al-Ittihad |
|---|---|---|
| Molina 85' | Report |
Al-Ittihad won 3–2 on aggregate.
| Zob Ahan | 1 – 2 (a.e.t.) | Suwon Samsung Bluewings |
|---|---|---|
| Ghazi 50' | Report | Yang Sang-Min 77' Neretljak 99' (pen.) |
Suwon Samsung Bluewings won 3–2 on aggregate.
Al-Sadd won 4–2 on aggregate.
The first legs were played 19 October 2011, and the second legs were played 26 October 2011. [4]
| Team 1 | Agg. | Team 2 | 1st leg | 2nd leg |
|---|---|---|---|---|
| Suwon Samsung Bluewings | 1–2 | Al-Sadd | 0–2 | 1–0 |
| Al-Ittihad | 3–5 | Jeonbuk Hyundai Motors | 2–3 | 1–2 |
| Suwon Samsung Bluewings | 0 – 2 | Al-Sadd |
|---|---|---|
| Report | Niang 70', 81' |
| Al-Ittihad | 2 – 3 | Jeonbuk Hyundai Motors |
|---|---|---|
| Hazazi 6', 18' | Report | Eninho 2' Son Seung-Joon 57'Cho Sung-Hwan 77' |
| Jeonbuk Hyundai Motors | 2 – 1 | Al-Ittihad |
|---|---|---|
| Eninho 22', 36' | Report | Wendel 73' |
Jeonbuk Hyundai Motors won 5–3 on aggregate.
| Al-Sadd | 0 – 1 | Suwon Samsung Bluewings |
|---|---|---|
| Report | Oh Jang-Eun 7' |
Al-Sadd won 2–1 on aggregate.
The final was played 5 November 2011 at home of one of the finalists, decided by draw. [1] [4] This format is different from the 2009 and 2010 editions, where the final was played at a neutral venue. [7]
| Jeonbuk Hyundai Motors | 2 – 2 (a.e.t.) | Al-Sadd |
|---|---|---|
| Eninho 17' Lee Seung-Hyun 90+2' | Report | Sim Woo-Yeon 30' (o.g.) Keïta 61' |
| Penalties | ||
Eninho  Kim Dong-Chan  Park Won-Jae Kim Sang-Sik | 2 – 4 | Niang Al-Haydos Lee Jung-Soo Majid Belhadj |
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