| Europa League 1971/1972 - Appearances as Referee |  |
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| 14/09/1971 | FC Den Haag-ADO | - | Aris Bonnevoie | 5:0 | 1 | - | - |
| 29/09/1971 | Djurgårdens IF | - | OFK Beograd | 2:2 | 2 | - | - |
| Europa League 1971/1972 - Appearances as Referee | |
|
|
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| 14/09/1971 | FC Den Haag-ADO | - | Aris Bonnevoie | 5:0 | 1 | - | - |
| 29/09/1971 | Djurgårdens IF | - | OFK Beograd | 2:2 | 2 | - | - |
| Complete name: | John Clive Thomas |
| Born: | 22/06/1936 |
| Place of birth: |
Wales |
| Residence: | Treorchy |
| Nationality: |
Wales |