| Land | Runde | ⊝ Age | Teilnahmen |
| Aberdeen | Schottland | Play-off | 24,3 | 11 |
| Aktobe | Kasachstan | 1. Runde | 26,8 | 7 |
| BK Häcken | Schweden | 3. Runde | 25,5 | 7 |
| Beer Sheva | Israel | 1. Runde | 27,6 | 5 |
| Bergen | Norwegen | Play-off | 24,8 | 7 |
| Braga | Portugal | Play-off | 25,6 | 9 |
| Celje | Slowenien | 2. Runde | 26,5 | 7 |
| Cluj | Rumänien | 3. Runde | 26,8 | 5 |
| Dynamo Kiev | Ukraine | Play-off | 26,0 | 3 |
| FC Noah | Armenien | 3. Runde | 28,1 | 1 |
| FC Prishtina | International | 1. Runde | 24,8 | 4 |
| Fredrikstad | Norwegen | 3. Runde | 25,1 | 2 |
| Genf | Schweiz | 3. Runde | 26,4 | 5 |
| Genk | Belgien | Play-off | 24,1 | 7 |
| Hamrun Spart | Malta | 3. Runde | 26,2 | 0 |
| Ilves Tampere | Finnland | 1. Runde | 24,4 | 2 |
| KF Drita | International | 3. Runde | 26,8 | 2 |
| Kopavogur | Island | 3. Runde | 26,4 | 6 |
| Kuopio PS | Finnland | Play-off | 24,4 | 5 |
| L. Warschau | Polen | 3. Runde | 26,1 | 14 |
| Larnaka | Zypern | Play-off | 27,5 | 8 |
| Levski Sofia | Bulgarien | 2. Runde | 25,2 | 11 |
| Lincoln FC | Gibraltar | Play-off | 28,8 | 6 |
| Ludogorets | Bulgarien | Play-off | 27,8 | 7 |
| M. Tel Aviv | Israel | Play-off | 25,7 | 13 |
| Malmö FF | Schweden | Play-off | 26,5 | 6 |
| Midtjylland | Dänemark | Play-off | 26,0 | 13 |
| Mostar | Bosnien-Herzegowina | Play-off | 26,6 | 9 |
| Olomouc | Tschechien | Play-off | 25,9 | 4 |
| P. Belgrad | Serbien | 1. Runde | 24,5 | 16 |
| PAOK Saloniki | Griechenland | Play-off | 26,9 | 11 |
| Paks | Ungarn | 1. Runde | 28,4 | 2 |
| Panathinaikos | Griechenland | Play-off | 26,9 | 6 |
| Poznan | Polen | Play-off | 24,7 | 10 |
| Riga FC | Lettland | 3. Runde | 26,4 | 4 |
| Rijeka | Kroatien | Play-off | 24,9 | 13 |
| S. Tiraspol | Moldawien | 2. Runde | 24,2 | 14 |
| SK SLovan | Slowakei | Play-off | 27,5 | 15 |
| Sabah | Aserbaidschan | 1. Runde | 26,6 | 0 |
| Samsunspor | Türkei | Play-off | 25,8 | 0 |
| Shakhtar | Ukraine | 3. Runde | 24,0 | 1 |
| Shelbourne | Irland | 3. Runde | 24,2 | 3 |
| Steaua | Rumänien | Play-off | 27,3 | 10 |
| Tetovo | Mazedonien | Play-off | 26,5 | 8 |
| Trnava | Slowakei | 1. Runde | 27,8 | 10 |
| Utrecht | Niederlande | Play-off | 25,2 | 5 |
| Wolfsberg | Österreich | 3. Runde | 25,4 | 1 |
| Y.B. Bern | Schweiz | Play-off | 26,1 | 10 |
Insgesamt nehmen 48 Mannschaften teil. The number of participations refers to tournament participations before the tournament. Sabah, Hamrun Spartans und Samsunspor are participating in for the first time.