| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| GK | Balázs Megyeri | 1990-03-31 | 188 | 88 | 2018-06-30 | ||
| GK | Lefteris Choutesiotis | 1994-07-20 | 192 | ||||
| GK | Roberto Jiménez Gago | 1986-02-10 | 191 | 80 | 2019-06-30 | ||
| D | Alberto Botía | 1989-01-27 | 187 | 80 | 2018 jun | ||
| D | Anastasios Avlonitis | 1990-01-01 | 190 | 2017 jun | |||
| D | Arthur Masuaku | 1993-11-07 | 179 | 70 | 2020-06-30 | ||
| D | Dimitrios Siovas | 1988-09-16 | 191 | 85 | 2021-06-30 | ||
| D | Éric Abidal | 1979-09-11 | 186 | 75 | Retired | ||
| D | Felipe Santana | 1986-03-17 | 194 | 80 | 2016-06-30 | ||
| D | Giannis Maniatis | 1986-10-12 | 178 | 72 | 2017 jun | ||
| D | Konstantinos Giannoulis | 1987-12-09 | 183 | 73 | 2018 jun | ||
| D | Leandro Salino | 1985-04-22 | 168 | 62 | 2016 jun | ||
| D | Omar Elabdellaoui | 1991-12-05 | 179 | 73 | |||
| M | Alejandro Domínguez | 1981-06-10 | 175 | 73 | 2015 jun | ||
| M | Andreas Bouchalakis | 1993-04-05 | 185 | 2017 jun | |||
| M | David Fuster | 1982-02-03 | 178 | 71 | 2017-06-30 | ||
| M | Ibrahim Afellay | 1986-04-02 | 180 | 68 | 2019-06-30 | ||
| M | Jimmy Durmaz | 1989-03-22 | 180 | 70 | |||
| M | Luka Milivojevic | 1991-04-07 | 186 | 80 | 2020-06-30 | ||
| M | Pajtim Kasami | 1992-06-02 | 187 | 70 | 2018 jun | ||
| F | Dimitrios Diamantakos | 1993-03-05 | 182 | 74 | 2019-06-30 | ||
| F | Islam Feruz | 1995-10-09 | 163 | 55 | 2019-06-30 | ||
| F | Jorge Benitez | 1992-09-02 | 182 | 78 | 2018 jun | ||
| F | Konstantinos Mitroglou | 1988-03-12 | 188 | 78 | |||
| F | Nikolaos Vergos | 1996-01-13 | 183 | 77 | 2017-06-30 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 28.Dec | Bobby Allain (GK) | Olympiakos SP Piraeus | Örebro SK | Confirmed | |
| 31.Jan | Tarik Elyounoussi (F) | Olympiakos SP Piraeus | AIK | Confirmed | |
| 30.Jun | Juan Carlos Paredes (D) | Olympiakos SP Piraeus | Watford FC | Confirmed | |
| 30.Jun | Omar Elabdellaoui (D) | Hull City AFC | Olympiakos SP Piraeus | Confirmed | |
| 30.Jun | Pajtim Kasami (M) | Nottingham Forest | Olympiakos SP Piraeus | Confirmed | |
| 30.Jun | Aly Cissokho (D) | Olympiakos SP Piraeus | Aston Villa FC | Confirmed | |
| 31.Jan | Luka Milivojevic (M) | Olympiakos SP Piraeus | Crystal Palace | Confirmed | |
| 31.Jan | Juan Carlos Paredes (D) | Watford FC | Olympiakos SP Piraeus | Confirmed | |
| 20.Jan | Omar Elabdellaoui (D) | Olympiakos SP Piraeus | Hull City AFC | Confirmed | |
| 16.Jan | Aly Cissokho (D) | Aston Villa FC | Olympiakos SP Piraeus | Confirmed |