Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 04/2018 |  | Xesc Regis | FW | |||
| 01/2018 |  | Vukašin Jovanović | DF |  | Girondins de Bordeaux | Bordeaux |
| 01/2018 | | Ángel López | MF | |||
| 01/2018 |  | Pape Diop | MF |  | RCD Espanyol | RCD Espanyol |
| 01/2018 |  | Fabián Orellana | FW |  | Valencia CF | Valencia |
| 11/2017 | | Areitio | GK | |||
| 11/2017 | | Julen Azkue | MF | |||
| 10/2017 | | Imanol Sarriegi | MF | |||
| 09/2017 | | Lombán | DF | |||
| 07/2017 |  | Paulo Oliveira | DF |  | Sporting CP | Sporting |
| 07/2017 | | Cote | DF |  | FC Porto | FC Porto |
| 07/2017 | | Joan Jordán | MF | | RCD Espanyol | RCD Espanyol |
| 07/2017 |  | Charles | FW | |||
| 07/2017 | | Marko Dmitrović | GK |  | AD Alcorcón | Alcorcón |
| 07/2017 | | Jon Ander | GK |  | CF Badalona Futur | Badalona Futur |
| 07/2017 | | Jordi Calavera | DF |  | CD Lugo | Lugo |
| 07/2017 | | Iván Alejo | FW | | AD Alcorcón | Alcorcón |
| 07/2017 | | Juanfran | FW |  | UD Logroñés | UD Logroñés |
| 07/2017 | | Thaylor Lubanzadio | FW |  | Real Unión | Real Unión |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2018 | | Christian Rivera | MF |  | FC Barcelona B | Barcelona B |
| 01/2018 | | Gálvez | DF |  | UD Las Palmas | UD Las Palmas |
| 09/2017 | | Nano Mesa | FW |  | Levante UD | Levante |
| 08/2017 | | Thaylor Lubanzadio | FW |  | Caudal Deportivo | Caudal |
| 08/2017 | | Jordi Calavera | DF |  | Sporting Gijón | Sporting Gijón |
| 08/2017 | | Juanfran | FW |  | Marbella FC | Marbella |
| 07/2017 | | Jon Ander | GK |  | CD Toledo | CD Toledo |
| 07/2017 |  | Mauro Dos Santos | DF |  | CD Leganés | Leganés |
| 07/2017 | | Adrián | MF |  | Málaga CF | Málaga |
| 07/2017 | | Antonio Luna | DF | | Levante UD | Levante |
| 07/2017 |  | Florian Lejeune | DF |  | Newcastle United | Newcastle |
| 07/2017 | | Imanol Sarriegi | MF |  | CD Vitoria | CD Vitoria |