| Yellow | VS Club | Date | Sections | |
|---|---|---|---|---|
| 4 | Galatasaray SK | 18-09-2018 | Group Stage | Match details |
| 3 | FC Schalke 04 | 11-12-2018 | Group Stage | Match details |
| 3 | FC Porto | 24-10-2018 | Group Stage | Match details |
| 3 | FC Schalke 04 | 03-10-2018 | Group Stage | Match details |
| 2 | Galatasaray SK | 28-11-2018 | Group Stage | Match details |
