| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| GK | Rui Patrício | 1988-02-15 | 188 | 84 | 2022-06-30 | ||
| D | Cédric Soares | 1991-08-31 | 169 | 62 | 2020-06-30 | ||
| D | Ewerton | 1989-03-23 | 188 | 81 | Loan | ||
| D | Mouhamadou-Naby Sarr | 1993-08-13 | 196 | 94 | 2020-06-30 | ||
| D | Paulo Oliveira | 1992-01-08 | 187 | 79 | 2021-06-30 | ||
| D | Ricardo Esgaio | 1993-05-16 | 171 | 66 | 2018-06-30 | ||
| D | Tobias Figueiredo | 1994-02-02 | 182 | 68 | 2021-06-30 | ||
| M | Adrien Silva | 1989-03-15 | 175 | 75 | 2021-06-30 | ||
| M | Andre Martins | 1990-01-21 | 166 | 56 | 2019-06-30 | ||
| M | Héldon | 1988-11-14 | 174 | 68 | Loan | ||
| M | Joao Mario | 1993-01-19 | 178 | 70 | 2021-06-30 | ||
| M | Simeon Slavchev | 1993-09-25 | 186 | - | Loan | ||
| M | William Carvalho | 1992-04-07 | 186 | 87 | 2020-06-30 | ||
| F | Andre Carrillo | 1991-06-14 | 182 | 77 | 2021-06-30 | ||
| F | Carlos Mané | 1994-03-11 | 172 | 55 | 2018-06-30 | ||
| F | Diego Capel | 1988-02-16 | 173 | 67 | 2018-06-30 | ||
| F | Islam Slimani | 1988-06-18 | 187 | 75 | 2021-06-30 | ||
| F | Nani | 1986-11-17 | 175 | 66 | 2019-06-30 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 30.Jun | Seydou Doumbia (F) | Sporting Club de Portugal | AS Roma | Confirmed | |
| 30.Jun | Carlos Mané (F) | VfB Stuttgart | Sporting Club de Portugal | Confirmed | |
| 30.Jun | Joel Campbell (F) | Sporting Club de Portugal | Arsenal FC | Confirmed | |
| 30.Jun | Ewerton (D) | FC Kaiserslautern | Sporting Club de Portugal | Confirmed | |
| 31.Aug | Lazar Markovic (M) | Liverpool FC | Sporting Club de Portugal | Confirmed | |
| 31.Aug | Naldo (D) | Sporting Club de Portugal | FK Krasnodar | Confirmed | |
| 31.Aug | Islam Slimani (F) | Sporting Club de Portugal | Leicester City | Confirmed | |
| 31.Aug | Carlos Mané (F) | Sporting Club de Portugal | VfB Stuttgart | Confirmed | |
| 31.Aug | Ewerton (D) | Sporting Club de Portugal | FC Kaiserslautern | Confirmed | |
| 29.Aug | Luc Castaignos (F) | Eintracht Frankfurt | Sporting Club de Portugal | Confirmed |