| Yellow | VS Club | Date | Sections | |
|---|---|---|---|---|
| 4 | Atletico Madrid | 12-04-2018 | Quarter-finals | Match details |
| 3 | Atletico Madrid | 05-04-2018 | Quarter-finals | Match details |
| 3 | Viktoria Plzen | 08-03-2018 | Round of 16 | Match details |
| 2 | Viktoria Plzen | 15-03-2018 | Round of 16 | Match details |
| 2 | FC Astana | 15-02-2018 | Round of 32 | Match details |
