| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| D | Marc Tierney | 1985-08-23 | 183 | 71 | |||
| M | Simon Hackney | 1984-02-05 | 173 | 65 | |||
| M | Tom Williams | 1980-07-08 | 180 | 79 | |||
| F | Freddie Ladapo | 1993-02-01 | 182 | 78 | 2018-06-30 | ||
| F | Liam Henderson | 1989-12-28 | 185 | 77 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 30.Jun | Glen Kamara (M) | Colchester United | Arsenal FC | Confirmed | |
| 18.Nov | George Moncur (M) | West Ham United | Colchester United | Confirmed | |
| 8.Aug | George Moncur (M) | West Ham United | Colchester United | Confirmed | |
| 24.Nov | Tom Aldred (D) | Colchester United | Torquay United | Confirmed | |
| 4.Nov | Casey Thomas (F) | Swansea City | Colchester United | Confirmed | |
| 31.Mar | Freddie Ladapo (F) | Colchester United | Chelmsford City FC | Confirmed | |
| 17.Mar | Tommy Smith (D) | Ipswich Town | Colchester United | Confirmed | |
| 25.Feb | Medy Elito (F) | Colchester United | Cheltenham Town | Confirmed | |
| 1.Oct | Tom Williams (M) | Bristol City | Colchester United | Confirmed | |
| 14.Sep | Liam Henderson (F) | Watford FC | Colchester United | Confirmed |