| Yellow | Clubs | VS Club | Date | Sections | |
|---|---|---|---|---|---|
| 6 | Lokomotiv Moscow | AS Monaco | 10-03-2004 | Round of 16 | Match details |
| 6 | Bayern Munich | Olympique Lyonnais | 05-11-2003 | Group Stage | Match details |
| 6 | FC Porto | Olympique Marseille | 22-10-2003 | Group Stage | Match details |
| 6 | Besiktas | Chelsea | 01-10-2003 | Group Stage | Match details |
| 5 | Juventus | Galatasaray SK | 02-12-2003 | Group Stage | Match details |
| 5 | PSV Eindhoven | AS Monaco | 25-11-2003 | Group Stage | Match details |
| 5 | AFC Ajax | Celta Vigo | 04-11-2003 | Group Stage | Match details |
| 5 | Celta Vigo | AFC Ajax | 22-10-2003 | Group Stage | Match details |
| 5 | Panathinaikos | Rangers | 01-10-2003 | Group Stage | Match details |
| 5 | Rangers | VfB Stuttgart | 16-09-2003 | Group Stage | Match details |
