| Europa League 1967/1968 - Appearances as Referee |  |
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| 20/09/1967 | Hibernian FC | - | FC Porto | 3:0 | - | - | - |
| 04/10/1967 | Dundee FC | - | DWS Amsterdam | 3:0 | - | - | - |
| Europa League 1967/1968 - Appearances as Referee | |
|
|
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| 20/09/1967 | Hibernian FC | - | FC Porto | 3:0 | - | - | - |
| 04/10/1967 | Dundee FC | - | DWS Amsterdam | 3:0 | - | - | - |
| Complete name: | John Adair Barker |
| Born: | 31/03/1919 |
| Place of birth: |
Northern Ireland |
| Residence: | Belfast |
| Nationality: |
Northern Ireland |