| NextGen | 28/08/12 | Athletic Club [Youth] | - | Olympiakos Piraeus [Youth] | 4:0 | ||||
| NextGen | 12/12/12 | Olympiakos Piraeus [Youth] | - | Athletic Club [Youth] | 1:0 |  |
| NextGen | 28/08/12 | Athletic Club [Youth] | - | Olympiakos Piraeus [Youth] | 4:0 | ||||
| NextGen | 12/12/12 | Olympiakos Piraeus [Youth] | - | Athletic Club [Youth] | 1:0 | |
| Iker Undabarrena Martínez | |
| Born: | 18.05.1995 |
| Place of birth: |
Gorliz, 
Spain |
| Nationality: |
Spain
|
| Height: | 181 cm |
| Weight: | 77 kg |
| Position(s): | Central Midfielder Defensive Midfielder |
| Foot: | right |