| Yellow | Clubs | VS Club | Date | Sections | |
|---|---|---|---|---|---|
| 7 | Partizan Belgrade | Ludogorets Razgrad | 31-07-2013 | Third Qualifying Round | Match details |
| 6 | FK Austria Wien | FH Hafnarfjordur | 07-08-2013 | Third Qualifying Round | Match details |
| 5 | Steaua Bucharest | Legia Warsaw | 27-08-2013 | Play offs | Match details |
| 5 | FH Hafnarfjordur | FK Austria Wien | 07-08-2013 | Third Qualifying Round | Match details |
| 5 | IF Elfsborg | Celtic | 31-07-2013 | Third Qualifying Round | Match details |
| 5 | Steaua Bucharest | Dinamo Tbilisi | 30-07-2013 | Third Qualifying Round | Match details |
| 5 | Maccabi Tel Aviv | FC Basel | 30-07-2013 | Third Qualifying Round | Match details |
| 5 | Slovan Bratislava | Ludogorets Razgrad | 17-07-2013 | Second Qualifying Rd | Match details |
| 5 | Zeljeznicar | Viktoria Plzen | 16-07-2013 | Second Qualifying Rd | Match details |
| 4 | Shakhter Karagandy | Celtic | 28-08-2013 | Play offs | Match details |
