Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 05/2019 |  | Patrice Lair | MA | |||
| 05/2019 | | Louis Carnot | MF |  | EA Guingamp U19 | U19 |
| 01/2019 |  | Mehdi Merghem | MF |  | LB Châteauroux | Châteauroux |
| 01/2019 |  | Papy Djilobodji | DF | |||
| 01/2019 |  | Johan Larsson | DF |  | Brøndby IF | Brøndby IF |
| 01/2019 |  | Didier Ndong | MF | |||
| 12/2018 |  | Alexandre Mendy | FW |  | Girondins de Bordeaux | Bordeaux |
| 11/2018 | | Jocelyn Gourvennec | MA | |||
| 11/2018 | | Sylvain Didot | MA |  | EA Guingamp B | EA Guingamp B |
| 10/2018 | | Steven Ako | DF | |||
| 10/2018 | | Mehdi Boudjemaa | MF | | EA Guingamp B | EA Guingamp B |
| 10/2018 | | Matthias Phaëton | FW | | EA Guingamp U19 | U19 |
| 08/2018 |  | Guessouma Fofana | MF |  | Amiens SC | Amiens |
| 08/2018 | | Ronny Rodelin | FW |  | SM Caen | SM Caen |
| 07/2018 | | Yohan Bilingi | DF | | EA Guingamp U19 | U19 |
| 07/2018 |  | Djegui Koita | DF | | EA Guingamp U19 | U19 |
| 07/2018 | | Cheick Traoré | DF | | LB Châteauroux | Châteauroux |
| 07/2018 | | Jérémy Livolant | MF |  | US Boulogne | US Boulogne |
| 07/2018 | | Nolan Roux | FW |  | FC Metz | Metz |
| 07/2018 | | Eric Blahic | AS-CO | | Girondins de Bordeaux | Bordeaux |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2019 | | Nathaël Julan | FW |  | Valenciennes FC | VAFC |
| 08/2018 | | Yannis Salibur | FW |  | AS Saint-Étienne | Saint-Étienne |
| 08/2018 | | Jimmy Briand | FW | | Girondins de Bordeaux | Bordeaux |
| 08/2018 | | Jérémy Livolant | MF | | LB Châteauroux | Châteauroux |
| 07/2018 | | Clément Grenier | MF |  | Stade Rennais | Stade Rennais |
| 07/2018 | | Moustapha Diallo | MF |  | Nîmes Olympique | Nîmes |
| 07/2018 | | Jonathan Martins | DF |  | FC Lorient | Lorient |