| Fecha | Jugador | Llega a | Tipo | Precio |
|---|---|---|---|---|
| 1 jul 2021 | Levi Colwill | Huddersfield Town | Cesión | — |
| 1 jul 2021 | Désiré Doué | Stade Rennais FC B | Fichaje | — |
| 1 jul 2021 | David Affengruber | Sturm Graz | Fichaje | €400k |
| 1 jul 2021 | Maroan Sannadi | Club San Ignacio | Fichaje | — |
| 1 jul 2021 | Rahim Alhassane | Paracuellos | Fichaje | — |
| 1 jul 2021 | Luca Koleosho | Esp. Juvenil A | Fichaje | — |
| 1 jul 2021 | Mads Bidstrup | Brentford FC | Fichaje | — |
| 1 jul 2021 | Fabio Chiarodia | SV Werder Bremen U19 | Fichaje | — |
| 1 jul 2021 | Junior Mwanga | G. Bordeaux B | Fichaje | — |
| 1 jul 2021 | Marcos Leiva Calvo | LevUD Fút.base | Fichaje | — |
| 1 jul 2021 | Onuralp Çevikkan | Altinordu FK U16 | Fichaje | Sin coste |
| 1 jul 2021 | Nayel Mehssatou | RSC Anderlecht | Fichaje | Sin coste |
| 1 jul 2021 | Antonio Raimondo | Bologna Primavera | Fichaje | — |
| 1 jul 2021 | Jelani Seedorf | Excelsior U18 | Fichaje | — |
| 1 jul 2021 | Juan Palomares | Atlético Sanluqueño CF | Fichaje | — |
| 1 jul 2021 | Ilane Touré | AS Monaco U17 | Fichaje | — |
| 1 jul 2021 | Mario Solórzano Diestro | Bansander Juv.A | Fichaje | — |
| 1 jul 2021 | Francis Onyeka | Bayer 04 Leverkusen U17 | Fichaje | — |
| 1 jul 2021 | Yoan Koré | Paris FC B | Fichaje | — |
| 1 jul 2021 | Dom Ballard | Southampton FC U18 | Fichaje | Sin coste |
| 1 jul 2021 | Pere Joan García Bauzà | RCD Mallorca B | Fichaje | — |
| 1 jul 2021 | Elias Filet | FC Sochaux-Montbéliard B | Fichaje | Sin coste |
| 1 jul 2021 | Antonio Espigares | Villarreal CF U19 | Fichaje | — |
| 1 jul 2021 | Lalo Aguilar | CD Leganés B | Fichaje | — |
| 1 jul 2021 | Gerard Martín | Cornellà | Fichaje | — |
| 1 jul 2021 | Pelayo Fernández | Barça Juv A | Fichaje | — |
| 1 jul 2021 | Amir Abrashi | Grasshopper Club Zurich | Fichaje | Sin coste |
| 1 jul 2021 | Tomas Chory | Plzen | N/A | N/A |
| 1 jul 2021 | Sydney Osazuwa | Getafe Fút.base | Fichaje | — |
| 1 jul 2021 | Diógenes | Santos FC | Fichaje | Sin coste |
| 1 jul 2021 | Amin Ramazanov | Qarabag 2 Agdam | Fichaje | — |
| 1 jul 2021 | Said El Mala | TSV Meerbusch U17 | Fichaje | — |
| 1 jul 2021 | Birger Verstraete | Royal Amberes FC | Fichaje | €2.0M |
| 1 jul 2021 | Axel Kayombo | Servette FC U18 | Fichaje | Sin coste |
| 1 jul 2021 | Jack Hinshelwood | Brighton & Hove Albion U18 | Fichaje | — |
| 1 jul 2021 | Samu Rodríguez | CF Talavera de la Reina U19 | Fichaje | — |
| 1 jul 2021 | Diego Hormigo | Sevilla Juv. A | Fichaje | — |
| 1 jul 2021 | Antonio Moya Vega | Deportivo Alavés | Fichaje | — |
| 1 jul 2021 | Metehan Altunbaş | LASK Amateure OÖ | Cesión | Préstamo / cesión |
| 1 jul 2021 | Ibon Sánchez | Athletic Bilbao U19 | Fichaje | — |