| Europa League 2018/2019 - Appearances as Referee |  |
 |
 |
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| 20/09/2018 | PAOK Saloniki | - | Chelsea FC | 0:1 | 5 | - | - |
| 21/02/2019 | Arsenal FC | - | BATE Borisov | 3:0 | - | - | - |
| 11/04/2019 | Arsenal FC | - | SSC Napoli | 2:0 | 1 | - | - |
| Europa League 2018/2019 - Appearances as Referee | |
|
|
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| 20/09/2018 | PAOK Saloniki | - | Chelsea FC | 0:1 | 5 | - | - |
| 21/02/2019 | Arsenal FC | - | BATE Borisov | 3:0 | - | - | - |
| 11/04/2019 | Arsenal FC | - | SSC Napoli | 2:0 | 1 | - | - |
| Complete name: | Alberto Undiano Mallenco |
| Born: | 08/10/1973 |
| Place of birth: |
Pamplona, 
Spain |
| Residence: | Ansoain |
| Nationality: |
Spain |
| Height: | 181 cm |
| Weight: | 73 kg |