| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| GK | Fernando Pacheco | 1992-05-18 | 187 | 81 | 2020-06-30 | ||
| GK | Jacob Sánchez | 1991-08-28 | 185 | 2016 Jun | |||
| GK | Rubén Yáñez | 1993-10-12 | 187 | 80 | |||
| GK | Tomás Mejías | 1989-01-30 | 195 | 81 | 2018-06-30 | ||
| D | David Mateos | 1987-04-22 | 190 | 82 | |||
| D | Derik Osede | 1993-02-21 | 183 | 74 | |||
| D | Diego Llorente | 1993-08-16 | 185 | 74 | 2022-06-30 | ||
| D | Javier Noblejas | 1993-03-18 | 187 | 77 | 2018-06-30 | ||
| D | Jorge Pulido | 1991-04-08 | 185 | 2016-06-30 | |||
| D | Jorge Casado | 1989-06-26 | 177 | 72 | 2016-06-30 | ||
| D | Kiko Femenia | 1991-02-02 | 174 | 61 | 2021-06-30 | ||
| D | Leandro Cabrera | 1991-06-17 | 187 | 81 | 2020-06-30 | ||
| D | Quini | 1989-09-24 | 179 | 70 | 2017-06-30 | ||
| M | Álvaro Medrán | 1994-03-15 | 176 | 68 | 2020-06-30 | ||
| M | Borja García | 1990-11-02 | 175 | 72 | 2019-06-30 | ||
| M | Cristian Gomez | 1989-07-27 | 186 | 80 | |||
| M | Cristian Benavente Bristol | 1994-05-19 | |||||
| M | Jaime Romero | 1990-07-31 | 176 | 74 | 2018-06-30 | ||
| M | José Rodríguez | 1994-12-16 | 180 | 72 | 2019-06-30 | ||
| M | Lucas Torró | 1994-07-19 | 188 | 2017-06-30 | |||
| M | Omar Mascarell | 1993-02-02 | 180 | 70 | 2019-06-30 | ||
| M | Sergio Aguza | 1992-09-02 | 180 | 69 | 2017-06-30 | ||
| F | Antonio Rozzi | 1994-05-28 | 181 | 76 | |||
| F | Burgui | 1993-10-29 | 184 | 71 | 2021-06-30 | ||
| F | Henrique | 1991-05-27 | 177 | 74 | |||
| F | Lucas Vázquez | 1991-07-01 | 173 | 68 | 2020-06-30 | ||
| F | Óscar Plano | 1991-02-11 | 180 | 2017-06-30 | |||
| F | Pablo | 1992-06-23 | 185 | Loan | |||
| F | Raúl De Tomas | 1994-10-17 | 178 | ||||
| F | Rubén Sobrino | 1992-02-16 | 185 | 73 | 2021-06-30 | ||
| F | Rubén Belima | 1992-02-11 | 182 | 71 | |||
| F | Willian José | 1991-11-23 | 186 | 81 | 2021-06-30 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 30.Jun | Marcos Llorente (M) | Deportivo Alavés | Real Madrid Castilla | Confirmed | |
| 10.Aug | Marcos Llorente (M) | Real Madrid Castilla | Deportivo Alavés | Confirmed | |
| 30.Jun | Mario Hermoso (D) | Real Valladolid | Real Madrid Castilla | Confirmed | |
| 30.Jun | Raúl De Tomas (F) | Córdoba CF | Real Madrid Castilla | Confirmed | |
| 3.Sep | Eero Markkanen (F) | Real Madrid Castilla | RoPS | Confirmed | |
| 21.Aug | Eero Markkanen (F) | Real Madrid Castilla | Free Agent | Rumour | |
| 31.Jul | José Rodríguez (M) | Real Madrid Castilla | Galatasaray SK | Confirmed | |
| 20.Aug | Lucas Vázquez (F) | Real Madrid Castilla | RCD Espanyol | Confirmed | |
| 13.Aug | Borja García (M) | Real Madrid Castilla | Córdoba CF | Confirmed | |
| 6.Aug | Omar Mascarell (M) | Real Madrid Castilla | Derby County | Confirmed |