Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 06/2021 |  | Jing Reec | FW |  | Central Coast Mariners Academy | Central C. (A) |
| 12/2020 |  | Marcos Ureña | FW |  | Gwangju FC | Gwangju FC |
| 12/2020 | | Jaden Casella | MF |  | Rockdale Illinden FC | Rockd. Illinden |
| 12/2020 |  | Stefan Janković | MF |  | OFK Beograd | OFK Beograd |
| 12/2020 |  | Michał Janota | MF | |||
| 12/2020 | | Stefan Nigro | DF |  | Green Gully SC | Green Gully |
| 10/2020 | | Oliver Bozanić | MF | |||
| 09/2020 | | Daniel Hall | DF | | Central Coast Mariners Academy | Central C. (A) |
| 09/2020 | | Max Balard | MF | | Central Coast Mariners Academy | Central C. (A) |
| 09/2020 | | Jordan Smylie | FW | | Central Coast Mariners Academy | Central C. (A) |
| 09/2020 | | Damian Tsekenis | FW | | Central Coast Mariners Academy | Central C. (A) |
| 07/2020 | | Daniel Bouman | MF |  | SC Cambuur | SC Cambuur |
| 07/2020 | | Matthew Hatch | MF | | Central Coast Mariners Academy | Central C. (A) |
| 07/2020 | | Louis Khoury | MF |  | Curzon Ashton | Curzon Ashton |
| 07/2020 | | Peter Zoïs | GK-CO |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 12/2020 | | John Roberts | FW |  | Mt Druitt Town Rangers | Mt Druitt TR |
| 12/2020 |  | Ziggy Gordon | DF |  | Western Sydney Wanderers | Western Sydney |
| 10/2020 | | Jordan Murray | FW |  | Kerala Blasters | Kerala Blasters |
| 10/2020 | | Dylan Fox | DF |  | NorthEast United FC | NE United |
| 09/2020 | | Sam Silvera | FW |  | Paços de Ferreira | Ferreira |
| 09/2020 | | Milan Đurić | MF |  | FK Rad Beograd | FK Rad |
| 09/2020 | | Tommy Oar | FW |  | Macarthur FC | Macarthur FC |