| | Austria (2) |
|---|
| LASK Linz, | | Rapid Wien, |
| | | Belgium (2) |
|---|
| AA Gent, | | Cercle Brugge, |
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| Bosnia and Herzegovina (1) |
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| FK Borac Banja Luka, |
| | Cyprus (3) |
|---|
| APOEL Nicosia, | | Omonia Nicosia, | | Pafos FC, |
| | Czech Republic (1) |
|---|
| Mladá Boleslav, |
| |
| | | |
| Iceland (1) |
|---|
| Víkingur Reykjavík, |
| | Ireland (1) |
|---|
| Shamrock Rovers, |
| | |
| Moldova (1) |
|---|
| Petrocub Hincesti, |
| | Northern Ireland (1) |
|---|
| Larne FC, |
| | | Poland (2) |
|---|
| Jagiellonia, | | Legia Warszawa, |
|
| Portugal (1) |
|---|
| Vitória Guimarães, |
| | | Serbia (1) |
|---|
| TSC Backa Topola, |
| | Slovenia (2) |
|---|
| NK Celje, | | Olimpija Ljubljana, |
|
| | Sweden (1) |
|---|
| Djurgardens IF, |
| | Swiss (2) |
|---|
| FC Lugano, | | FC St. Gallen, |
| | Turkey (1) |
|---|
| Istanbul Başakşehir, |
|
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