| Champions League 2017/2018 - Appearances as Referee |  |
 |
 |
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| 12/09/2017 | SL Benfica | - | CSKA Moskva | 1:2 | 5 | - | - |
| 17/10/2017 | Feyenoord | - | Shakhtar Donetsk | 1:2 | 5 | 1 | - |
| 21/11/2017 | AS Monaco | - | RB Leipzig | 1:4 | 5 | - | - |
| 13/03/2018 | AS Roma | - | Shakhtar Donetsk | 1:0 | 5 | - | 1 |
| Champions League 2017/2018 - Appearances as Referee | |
|
|
||||
| 12/09/2017 | SL Benfica | - | CSKA Moskva | 1:2 | 5 | - | - |
| 17/10/2017 | Feyenoord | - | Shakhtar Donetsk | 1:2 | 5 | 1 | - |
| 21/11/2017 | AS Monaco | - | RB Leipzig | 1:4 | 5 | - | - |
| 13/03/2018 | AS Roma | - | Shakhtar Donetsk | 1:0 | 5 | - | 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 |