Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/1991 |  | Peres | GK | |||
| 07/1991 |  | Nail Beširović | MF |  | Sloboda Tuzla | Sloboda Tuzla |
| 07/1991 | | Chalana | MF |  | Os Belenenses | Belenenses |
| 07/1991 | | Cristóvão | MF |  | FC Famalicão | FC Famalicão |
| 07/1991 | | Mário Jorge | MF |  | Sporting CP | Sporting |
| 07/1991 | | Paulo Padinha | MF |  | União Torreense | Torreense |
| 07/1991 | | João Luis | FW | | Sporting CP | Sporting |
| 07/1991 | | Paulo Ferreira | FW | |||
| 07/1991 |  | Vata | FW |  | SL Benfica | Benfica |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/1991 |  | Hugo | GK |  | S.C. Braga | S.C. Braga |
| 07/1991 | | Costeado | DF |  | FC Penafiel | Penafiel |
| 07/1991 | | Duílio | DF |  | AD Ovarense | AD Ovarense |
| 07/1991 | | Jorge Mota | DF | | União Torreense | Torreense |
| 07/1991 | | Elias | MF |  | FC Tirsense | FC Tirsense |
| 07/1991 | | Marito | MF |  | GD Chaves | GD Chaves |
| 07/1991 | | Miranda | MF |  | SC Beira-Mar | SC Beira-Mar |
| 07/1991 | | Paulo Bento | MF |  | Vitória Guimarães | Vitória SC |
| 07/1991 | | Abel Campos | FW | | S.C. Braga | S.C. Braga |
| 07/1991 | | Mendes | FW |  | Académica de Coimbra | Académica |
| 07/1991 |  | Ricky Owubokiri | FW |  | Boavista | Boavista |
| 07/1991 | | Paulo Jorge | FW | | Vitória Guimarães | Vitória SC |
| 07/1991 | | Manuel Fernandes | MA | | AD Ovarense | AD Ovarense |
| 07/1991 | | José Mourinho | AS-CO | | AD Ovarense | AD Ovarense |