Qualification
The 'developing' 14 nations in the Asian Football Confederation were invited to nominate one or two clubs to participate in the 2004 competition.
West Asia
| Syria (2) | Al-Jaish (2002–03 Syrian League champions) Al-Wahda (2002–03 Syrian Cup winners) |
| Lebanon (2) | Olympic Beirut (2002–03 Lebanese Premier League champions & 2003 Lebanese FA Cup winners) Al-Nejmeh (2002–03 Lebanese Premier League runners-up) |
| Oman (1) | Dhofar (2002–03 Omani League champions) |
| Yemen (1) | Al-Sha'ab Ibb (2002–03 Yemeni League champions) Al-Wahda Sana'a (2002 Yemeni League champions) |
East Asia
| Hong Kong (1) |
Happy Valley (2002–03 Hong Kong First Division League champions) |
Central and Southern Asia
| Bangladesh (1) | Muktijoddha Sangsad (2003 Bangladesh National Football Championship champions & 2003 Bangladesh Federation Cup winners) Mohammedan (2003 Bangladesh National Football Championship runners-up) |
| India (2) | East Bengal (2002–03 Indian National Football League champions) Mahindra United (2003 Indian Federation Cup winners) |
| Turkmenistan (2) | Nisa Aşgabat (2003 Turkmenistan League champions) Nebitçi Balkanabat (2003 Turkmenistan Cup winners) |
ASEAN
| Maldives (2) | Valencia (2003 Dhivehi League champions) Island FC (2003 Maldives FA Cup winners) |
| Malaysia (2) | Perak (2003 Malaysia Premier 1 League champions) Negeri Sembilan (2003 Malaysia FA Cup winners) |
| Singapore (2) | Home United (2003 S.League champions & 2003 Singapore Cup winners) Geylang United (2003 S.League runners-up) |
Read more about this topic: 2004 AFC Cup