| Fecha | Jugador | Llega a | Tipo | Precio |
|---|---|---|---|---|
| 1 jul 2021 | Chris Forino | Wycombe Wanderers | Fichaje | Sin coste |
| 1 jul 2021 | Jon Karrikaburu | Real Sociedad B | Fichaje | — |
| 1 jul 2021 | Yoan Koré | Paris FC B | Fichaje | — |
| 1 jul 2021 | Kiernan Dewsbury-Hall | Leicester City | Fichaje | — |
| 1 jul 2021 | Lukas Ullrich | Hertha BSC U19 | Fichaje | — |
| 1 jul 2021 | Rubén Torres Manzanares | AD Parla | Fichaje | — |
| 1 jul 2021 | Joel Allen Cotterill | Swansea U18 | Fichaje | — |
| 1 jul 2021 | Damienus Reverson | AZ Alkmaar U21 | Fichaje | Sin coste |
| 1 jul 2021 | Roberto Doncel García | Unionistas de Salamanca CF | N/A | N/A |
| 1 jul 2021 | Kike Pérez | Elche CF | Cesión | — |
| 1 jul 2021 | Yan Diomande | Yulee Hornets | Fichaje | — |
| 1 jul 2021 | Nico González | ACF Fiorentina | Fichaje | €27.4M |
| 1 jul 2021 | Carlos Vinícius Alves Morais | SL Benfica | N/A | N/A |
| 1 jul 2021 | Iñaki González | CD Badajoz U19 | Fichaje | — |
| 1 jul 2021 | Isaac Cossier | Jeanne d'Arc de Drancy U17 | Fichaje | — |
| 1 jul 2021 | Gavin Molloy | Shelbourne FC | Fichaje | — |
| 1 jul 2021 | David Ozoh | Crystal Palace U18 | Fichaje | Sin coste |
| 1 jul 2021 | Başar Önal | Graafschap U18 | Fichaje | — |
| 1 jul 2021 | Julio Díaz | Atlético Juv. B | Fichaje | — |
| 1 jul 2021 | Roberto López | Real Sociedad B | Fichaje | — |
| 1 jul 2021 | Leny Yoro | LOSC Lille U19 | Fichaje | — |
| 1 jul 2021 | Hermann Malonga | Paris Saint-Germain Youth | Fichaje | — |
| 1 jul 2021 | Fabrício Garcia | GD Fabril Barreiro | Fichaje | — |
| 1 jul 2021 | Aleksa Terzić | ACF Fiorentina | Fichaje | — |
| 1 jul 2021 | Roberto Fernández | Málaga CF | Fichaje | — |
| 1 jul 2021 | Rafel Bauzà | Espanyol Barcelona U18 | Fichaje | — |
| 1 jul 2021 | Víctor Barberá | FC Barcelona U19 | Fichaje | — |
| 1 jul 2021 | Paulino de la Fuente Gómez | Málaga CF | Fichaje | — |
| 1 jul 2021 | Adrián Lopes Marqués | Oviedo Fút.base | Fichaje | — |
| 1 jul 2021 | Yannick Ferreira Eduardo | NEC U17 | Fichaje | — |
| 1 jul 2021 | Strahinja Pavlović | AS Monaco FC | N/A | N/A |
| 1 jul 2021 | Kaare Barslund | FC Nordsjaelland U19 | Fichaje | Sin coste |
| 1 jul 2021 | Chemsdine Talbi | Club Brugge U18 | Fichaje | — |
| 1 jul 2021 | Ignacio Ferri Julià | Frankfurt U19 | Fichaje | — |
| 1 jul 2021 | Pepê | FC Oporto | € 15M | €15.0M |
| 1 jul 2021 | August Priske | FC Midtjylland U19 | Fichaje | Sin coste |
| 1 jul 2021 | Declan John | Bolton Wanderers | Fichaje | Sin coste |
| 1 jul 2021 | Lasse Günther | FC Augsburgo | Fichaje | — |
| 1 jul 2021 | Miliano Jonathans | Vitesse U21 | Fichaje | — |
| 1 jul 2021 | Finlay Pollock | Heart of Midlothian FC | Fichaje | — |