| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| D | Bradley Garmston | 1994-01-18 | 183 | 80 | 2018-06-30 | ||
| D | Max Ehmer | 1992-02-03 | 188 | 70 | 2018-06-30 | ||
| D | Paul Konchesky | 1981-05-15 | 178 | 69 | 2017-06-30 | ||
| M | Chris Herd | 1989-04-04 | 173 | 76 | 2017-06-31 | ||
| F | Frank Nouble | 1991-09-24 | 190 | 82 | |||
| F | Joe Quigley | 1996-12-10 | 191 | 2017-06-30 | |||
| F | Rory Donnelly | 1992-02-18 | 188 | 81 | 2017-06-30 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 5.Mar | Noel Mbo (F) | Gillingham FC | Helsingborgs IF | Confirmed | |
| 30.Jun | Joe Quigley (F) | Gillingham FC | AFC Bournemouth | Confirmed | |
| 30.Jun | Baily Cargill (D) | Gillingham FC | AFC Bournemouth | Confirmed | |
| 4.Oct | Chris Herd (M) | Free Agent | Gillingham FC | Confirmed | |
| 4.Oct | Frank Nouble (F) | Free Agent | Gillingham FC | Confirmed | |
| 31.Aug | Baily Cargill (D) | AFC Bournemouth | Gillingham FC | Confirmed | |
| 21.Jul | Paul Konchesky (D) | Leicester City | Gillingham FC | Confirmed | |
| 8.Jul | Joe Quigley (F) | AFC Bournemouth | Gillingham FC | Confirmed | |
| 30.Jun | Andrew Crofts (M) | Gillingham FC | Brighton & Hove Albion | Confirmed | |
| 21.Mar | Andrew Crofts (M) | Brighton & Hove Albion | Gillingham FC | Confirmed |