| Yellow | VS Club | Date | Sections | |
|---|---|---|---|---|
| 3 | FC Porto | 04-11-1998 | Group Stage | Match details |
| 2 | FC Porto | 21-10-1998 | Group Stage | Match details |
| 1 | Olympiakos | 09-12-1998 | Group Stage | Match details |
| 1 | AFC Ajax | 25-11-1998 | Group Stage | Match details |
| 1 | Olympiakos | 30-09-1998 | Group Stage | Match details |
