| Fecha | Jugador | Llega a | Tipo | Precio |
|---|---|---|---|---|
| 1 jul 2021 | Alejandro Costa Quijano | Las Rozas Juv.A | Fichaje | — |
| 1 jul 2021 | Gustav Mortensen | Lyngby Boldklub U19 | Fichaje | Sin coste |
| 1 jul 2021 | David Gugganig | Wolfsberger AC | Fichaje | Sin coste |
| 1 jul 2021 | Tiago Esgaio | SC Braga | N/A | N/A |
| 1 jul 2021 | Rafik Belghali | Lommel SK | Fichaje | — |
| 1 jul 2021 | Eñaut Lete Larrañaga | Real Soc. Juv.A | Fichaje | — |
| 1 jul 2021 | Davide Bartesaghi | Milan Under 17 | Fichaje | — |
| 1 jul 2021 | Lovro Štubljar | NK Domzale U19 | Fichaje | — |
| 1 jul 2021 | Mohamed Bouldini | CD Santa Clara | Free | Free |
| 1 jul 2021 | Wibuala Junior Bita Bueto | Athletic Juv. A | Fichaje | — |
| 1 jul 2021 | Assane Diao | Betis Fútb.base | Fichaje | — |
| 1 jul 2021 | Patrick Dorgu | Nordsjaell. U19 | Fichaje | — |
| 1 jul 2021 | Unax Agote | Real Sociedad C | Fichaje | — |
| 1 jul 2021 | Gyan de Regt | Vitesse Arnhem U21 | Fichaje | — |
| 1 jul 2021 | Pierre Ekwah | West Ham United FC | Fichaje | — |
| 1 jul 2021 | Floris Smand | SC Cambuur-Leeuwarden U21 | Fichaje | — |
| 1 jul 2021 | Nicolás Toca Diego | Leonesa Juv. A | Fichaje | — |
| 1 jul 2021 | Scott Twine | Milton Keynes Dons | Fichaje | Sin coste |
| 1 jul 2021 | Benja Cremaschi | Inter Miami CF Academy | Fichaje | — |
| 1 jul 2021 | Tijjani Noslin | TOP Oss | Fichaje | — |
| 1 jul 2021 | Fabio Blanco | Eintracht Fráncfort | Fichaje | — |
| 1 jul 2021 | Gerson Santos da Silva | Olympique de Marseille | € 25M | €25.0M |
| 1 jul 2021 | Vinícius Tobias | Sport Club Internacional | Fichaje | — |
| 1 jul 2021 | Mick Schmetgens | SV Werder Bremen Youth | Fichaje | — |
| 1 jul 2021 | Jacques Ekomié | FC Girondins Bordeaux B | Fichaje | Sin coste |
| 1 jul 2021 | Brian Fariñas | FC Barcelona U16 | Fichaje | — |
| 1 jul 2021 | Artur Gajdos | AS Trencin | Fichaje | — |
| 1 jul 2021 | Mohammed Hamony | Le Havre U17 | Fichaje | — |
| 1 jul 2021 | Joël Drommel | PSV Eindhoven | Fichaje | €3.5M |
| 1 jul 2021 | Ginés Sorroche Piñero | Betis Juvenil A | Fichaje | — |
| 1 jul 2021 | Yvan Maye | Paris FC Youth | Fichaje | — |
| 1 jul 2021 | Dylan Ruward | PEC Zwolle U17 | Fichaje | — |
| 1 jul 2021 | Alan Minda | Independiente del Valle | Fichaje | Sin coste |
| 1 jul 2021 | Juan Larios | Manchester City U21 | Fichaje | — |
| 1 jul 2021 | Sean Dulic | TSV 1860 München U17 | Fichaje | — |
| 1 jul 2021 | Jonathan Dubasin | Girona FC | Fichaje | — |
| 1 jul 2021 | Ugo Raghouber | LOSC Lille B | Fichaje | Sin coste |
| 1 jul 2021 | Kevin Schade | SC Friburgo | Fichaje | — |
| 1 jul 2021 | Sabit Abdulai | Getafe CF B | Fichaje | — |
| 1 jul 2021 | Rodrigo Rêgo | FC Famalicão Sub-17 | Fichaje | — |