The 22-year-old, who has represented Spain at Under-21 level, has been on trial with the club in recent weeks.
The goalkeeper will be expected to challenge Ali Al-Habsi at the DW Stadium.
Robles spent part of last season on loan at Rayo Vallecano.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| C | Real Madrid | 34 | 27 | 6 | 1 | 74 | 22 | 52 | 87 |
| 2 | GironaGirona | 34 | 23 | 5 | 6 | 73 | 42 | 31 | 74 |
| 3 | Barcelona | 34 | 22 | 7 | 5 | 70 | 43 | 27 | 73 |
| 4 | Atletico MadridAtletico | 34 | 21 | 4 | 9 | 63 | 39 | 24 | 67 |
| 5 | Athletic Bilbao | 34 | 17 | 10 | 7 | 55 | 33 | 22 | 61 |
| 6 | Real Sociedad | 34 | 14 | 12 | 8 | 48 | 35 | 13 | 54 |
| 7 | Real BetisBetis | 34 | 13 | 13 | 8 | 43 | 39 | 4 | 52 |
| 8 | Valencia | 34 | 13 | 8 | 13 | 37 | 39 | -2 | 47 |
| 9 | Villarreal | 34 | 12 | 9 | 13 | 56 | 58 | -2 | 45 |
| 10 | Getafe | 34 | 10 | 13 | 11 | 41 | 47 | -6 | 43 |
| 11 | AlavesAlaves | 34 | 11 | 8 | 15 | 32 | 38 | -6 | 41 |
| 12 | Sevilla | 34 | 10 | 11 | 13 | 45 | 46 | -1 | 41 |
| 13 | Osasuna | 34 | 11 | 6 | 17 | 37 | 51 | -14 | 39 |
| 14 | Las PalmasLas Palmas | 34 | 10 | 7 | 17 | 30 | 43 | -13 | 37 |
| 15 | Celta Vigo | 34 | 8 | 10 | 16 | 40 | 52 | -12 | 34 |
| 16 | Rayo Vallecano | 34 | 7 | 13 | 14 | 27 | 43 | -16 | 34 |
| 17 | Mallorca | 34 | 6 | 14 | 14 | 27 | 40 | -13 | 32 |
| 18 | CadizCadiz | 34 | 4 | 14 | 16 | 23 | 49 | -26 | 26 |
| 19 | Granada | 34 | 4 | 9 | 21 | 36 | 64 | -28 | 21 |
| R | Almeria | 34 | 2 | 11 | 21 | 33 | 67 | -34 | 17 |
| > La Liga Full Table | |||||||||
