Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 02/2021 |  | Guerrero | FW |  | Nottingham Forest | Nott'm Forest |
| 01/2021 | | Roberto González | GK |  | Rayo Vallecano B | Rayo B |
| 01/2021 | | Manu Navarro | MF | | Rayo Vallecano B | Rayo B |
| 11/2020 | | Iker Recio | DF | | Rayo Vallecano B | Rayo B |
| 10/2020 | | Arratia | MF | |||
| 10/2020 |  | Luca Zidane | GK |  | Real Madrid | Real Madrid |
| 10/2020 | | Iván Martos | DF |  | UD Almería | Almería |
| 10/2020 | | Antoñín | FW |  | Granada CF | Granada CF |
| 09/2020 | | Fran García | DF |  | Real Madrid Castilla | RM Castilla |
| 08/2020 | | Andoni Iraola | MA | |||
| 08/2020 | | Unai Mendía | AS-CO | |||
| 08/2020 | | Adrián Carrasco | FW | |||
| 08/2020 |  | Lass Bangoura | FW |  | CD Lugo | Lugo |
| 08/2020 | | Sergio Benito | FW |  | Cultural Leonesa | CD Leonesa |
| 08/2020 | | Sergio Moreno | FW | |||
| 07/2020 |  | Abdoulaye Ba | DF |  | Deportivo A Coruña | Deportivo |
| 07/2020 | | Joseto González | GK | |||
| 07/2020 | | Mario Hernández | DF |  | UD SS Reyes | Sanse |
| 07/2020 | | Iván García | MF | |||
| 07/2020 | | Pablo de la Torre | PH-C |  | Valencia CF B | Valencia B |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 11/2020 | | Lass Bangoura | FW |  | Emelec | Emelec |
| 10/2020 | | Abdoulaye Ba | DF |  | FC Dinamo Bucureşti | Dinamo Bucurest |
| 10/2020 | | Sergio Benito | FW |  | Valladolid Promesas | Valladolid B |
| 10/2020 | | Sergio Moreno | FW |  | CD Mirandés | Mirandés |
| 09/2020 | | Adrián Carrasco | FW |  | Las Rozas CF | Las Rozas CF |
| 09/2020 | | Santamaría | GK |  | UD Logroñés | UD Logroñés |
| 08/2020 | | Mario de Luis | GK | | Real Madrid Castilla | RM Castilla |
| 08/2020 | | Javi Rubio | DF |  | CD Leganés | Leganés |
| 08/2020 | | Ángel Algobia | MF |  | Getafe CF B | Getafe B |
| 07/2020 | | Antonio Luna | DF |  | Levante UD | Levante |
| 07/2020 | | Saúl García | DF |  | CD Alavés | Alavés |
| 07/2020 | | Jorge De Frutos | FW | | Real Madrid | Real Madrid |
| 07/2020 | | Juan Villar | FW |  | CA Osasuna | Osasuna |
| 07/2020 | | Fabián Luzzi | MF |  | FC Barcelona U19 | Barcelona U19 |
| 07/2020 |  | Antonio Milić | DF |  | RSC Anderlecht | Anderlecht |