| Fecha | Jugador | Llega a | Tipo | Precio |
|---|---|---|---|---|
| 1 jul 2021 | Angelo Stiller | TSG 1899 Hoffenheim | Free | Free |
| 1 jul 2021 | Nguessan Rominigue Kouamé | ESTAC Troyes | Fichaje | €2.5M |
| 1 jul 2021 | William Osula | Sheffield United U21 | Fichaje | — |
| 1 jul 2021 | Nahuel Noll | TSG 1899 Hoffenheim | Fichaje | — |
| 1 jul 2021 | Zé Carlos | Gil Vicente FC | Cesión | Loan |
| 1 jul 2021 | Harry Whitwell | West Bromwich Albion U18 | Fichaje | Sin coste |
| 1 jul 2021 | David Douline | Servette FC | Fichaje | Sin coste |
| 1 jul 2021 | Matteo Politano | SSC Napoli | Fichaje | €22.1M |
| 1 jul 2021 | Kacper Potulski | Legia Warsaw Youth | Fichaje | — |
| 1 jul 2021 | Roggerio Nyakossi | Servette FC | Fichaje | Sin coste |
| 1 jul 2021 | Federico Ceccherini | Hellas Verona | Fichaje | €3.0M |
| 1 jul 2021 | Jessic Ngankam | SpVgg Greuther Fürth | Cesión | — |
| 1 jul 2021 | Ben Gibson | Norwich City | Fichaje | €9.3M |
| 1 jul 2021 | Loïc Williams Ntambue Kayumba Gironés | Girona FC B | Fichaje | — |
| 1 jul 2021 | Hannes Vernemmen | KAA Gent U18 | Fichaje | Sin coste |
| 1 jul 2021 | Youssef Enríquez | R. Madrid Juv.B | Fichaje | — |
| 1 jul 2021 | Mario Sesè Vera | Alzira | Fichaje | — |
| 1 jul 2021 | Peixinho | Gondomar SC U19 | Fichaje | — |
| 1 jul 2021 | Phillip Verhounig | AKA Red Bull Salzburg U16 | Fichaje | Sin coste |
| 1 jul 2021 | Ali Dembélé | ESTAC Troyes U19 | Fichaje | — |
| 1 jul 2021 | Matheus Martins | Fluminense Football Club | Fichaje | Sin coste |
| 1 jul 2021 | Fabio Gruber | FC Augsburgo II | Fichaje | — |
| 1 jul 2021 | Jesús Rodríguez | Real Betis Balompié Youth | Fichaje | — |
| 1 jul 2021 | Rubén Gómez | Villarreal CF C | Fichaje | — |
| 1 jul 2021 | Rúben Pereira | Chaves | N/A | N/A |
| 1 jul 2021 | Guillermo Súnico Alonso | R. Madrid Juv.B | Fichaje | — |
| 1 jul 2021 | Mats Møller Dæhli | 1. FC Núremberg | Fichaje | €1.5M |
| 1 jul 2021 | Eric Emanuel da Silva Moreira | St. Pauli U17 | Fichaje | — |
| 1 jul 2021 | Ranjan Neelakandan | FC Lugano U18 | Fichaje | Sin coste |
| 1 jul 2021 | Tiago Parente | SL Benfica U17 | Fichaje | Sin coste |
| 1 jul 2021 | Marvin Young | Sparta Rotterdam U18 | Fichaje | — |
| 1 jul 2021 | Quentin Merlin | FC Nantes | Fichaje | — |
| 1 jul 2021 | Billy Koumetio | Liverpool U23 | Fichaje | — |
| 1 jul 2021 | Rafael Fernandes | Sporting CP B | Fichaje | — |
| 1 jul 2021 | Javier García Mateo | Bansander Juv.A | Fichaje | — |
| 1 jul 2021 | Rajmund Tóth | ETO FC II | Fichaje | Sin coste |
| 1 jul 2021 | Keito Nakamura | Lask Juniors Linz | Cesión | — |
| 1 jul 2021 | Chris Rigg | Sunderland S18 | Fichaje | — |
| 1 jul 2021 | Marijan Österreicher | AKA Austria Wien U16 | Fichaje | Sin coste |
| 1 jul 2021 | Mohamed Bouldini | CD Santa Clara | Fichaje | Sin coste |