Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 04/2019 |  | Kaiser Lázaro | DF | |||
| 04/2019 | | Miguel Marí | FW | |||
| 10/2018 | | Areitio | GK | |||
| 08/2018 | | Marc Cucurella | MF |  | FC Barcelona | Barcelona |
| 08/2018 |  | Pablo de Blasis | FW |  | 1. FSV Mainz 05 | Mainz 05 |
| 07/2018 | | Bigas | DF |  | UD Las Palmas | UD Las Palmas |
| 07/2018 | | Sergio Álvarez | MF |  | Sporting Gijón | Sporting Gijón |
| 07/2018 | | Marc Cardona | FW |  | FC Barcelona B | Barcelona B |
| 07/2018 | | Elgezabal | DF |  | CD Numancia | Numancia |
| 07/2018 | | Gálvez | DF | | UD Las Palmas | UD Las Palmas |
| 07/2018 | | Jordi Calavera | DF | | Sporting Gijón | Sporting Gijón |
| 07/2018 | | José Martínez | DF | | FC Barcelona B | Barcelona B |
| 07/2018 | | Christian Rivera | MF | | FC Barcelona B | Barcelona B |
| 07/2018 |  | Bebé | FW |  | Rayo Vallecano | Rayo |
| 07/2018 | | Nano Mesa | FW | | Sporting Gijón | Sporting Gijón |
| 07/2018 | | Pablo Hervías | FW |  | Real Valladolid | Valladolid |
| 07/2018 | | Pere Milla | FW | | CD Numancia | Numancia |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2019 | | Pablo Hervías | FW | | Real Valladolid | Valladolid |
| 08/2018 | | Gálvez | DF | | Rayo Vallecano | Rayo |
| 08/2018 | | Bebé | FW | | Rayo Vallecano | Rayo |
| 08/2018 | | Yoel | GK | | Real Valladolid | Valladolid |
| 08/2018 | | Elgezabal | DF |  | AD Alcorcón | Alcorcón |
| 08/2018 | | Nano Mesa | FW |  | CD Tenerife | Tenerife |
| 07/2018 | | Christian Rivera | MF | | UD Las Palmas | UD Las Palmas |
| 07/2018 | | José Martínez | DF |  | Granada CF | Granada CF |
| 07/2018 | | Iván Alejo | FW |  | Getafe CF | Getafe |
| 07/2018 | | Capa | DF |  | Athletic Club | Athletic |
| 07/2018 |  | Vukašin Jovanović | DF |  | Girondins de Bordeaux | Bordeaux |
| 07/2018 | | Juncà | DF |  | Celta de Vigo | Celta de Vigo |
| 07/2018 | | Dani García | MF | | Athletic Club | Athletic |
| 07/2018 | | Fran Rico | MF | | Granada CF | Granada CF |
| 07/2018 |  | Takashi Inui | MF |  | Real Betis | Betis |
| 07/2018 | | Julen Azkue | MF |  | Arenas de Getxo | Arenas de Getxo |