# List of Belgian football transfers summer 2021

This is a list of Belgian football transfers for the 2021 summer transfer window. Only transfers involving a team from the professional divisions are listed, including the 18 teams in the Belgian First Division A and the 8 teams playing in the Belgian First Division B.
The summer transfer window opened on 1 July 2021 and towards the end of August 2021.
Note that several transfers were announced prior to the opening date. Furthermore, players without a club may join one at any time, either during or in between transfer windows. After the transfer window closes a few completed transfers might still be announced a few days later.

## Transfers

| Date | Name | Moving from | Moving to | Fee |
| 1 July 2021 | Ivann Botella | Lyon La Duchère | RWDM47 | Undisclosed |
| 1 July 2021 | Joris Delle | Free Agent | KV Kortrijk | Free |
| 1 July 2021 | Lasse Vigen Christensen | Brøndby IF | SV Zulte Waregem | Undisclosed |
| 1 July 2021 | Bent Sørmo | Kristiansund BK | SV Zulte Waregem | Undisclosed |
| 1 July 2021 | Joost van Aken | Sheffield Wednesday | SV Zulte Waregem | Undisclosed |
| 1 July 2021 | Alessandro Ciranni | Royal Excel Mouscron | SV Zulte Waregem | Undisclosed |
| 1 July 2021 | Marcel Mehlem | Royale Union Saint-Gilloise | SC Paderborn 07 | Undisclosed |
| 1 July 2021 | Matthew Sorinola | Milton Keynes Dons F.C. | Royale Union Saint-Gilloise | Undisclosed |
| 1 July 2021 | Marcel Lewis | Chelsea F.C. | Royale Union Saint-Gilloise | Undisclosed |
| 1 July 2021 | Bart Nieuwkoop | Feyenoord | Royale Union Saint-Gilloise | Undisclosed |
| 1 July 2021 | Jorben Vanhulle | KV Oostende | F.C.V. Dender E.H. | Free |
| 1 July 2021 | Fashion Sakala | KV Oostende | Rangers FC | Free |
| 1 July 2021 | Kenny Rocha Santos | AS Nancy Lorraine | KV Oostende | Undisclosed |
| 1 July 2021 | Iebe Swers | R.F.C. Seraing (1922) | KV Mechelen | Undisclosed |
| 1 July 2021 | Hugo Cuypers | Olympiacos F.C. | KV Mechelen | Undisclosed |
| 1 July 2021 | Senna Miangué | Cagliari Calcio | Cercle Brugge | Loan |
| 1 July 2021 | Jesper Daland | IK Start | Cercle Brugge | Undisclosed |
| 1 July 2021 | Stelios Andreou | Olympiakos Nicosia | R. Charleroi S.C. | Undisclosed |
| 1 July 2021 | Stefan Knezevic | FC Luzern | R. Charleroi S.C. | Undisclosed |
| 1 July 2021 | Aboubakar Keita | OH Leuven | R. Charleroi S.C. | Loan |
| 1 July 2021 | Louis Fortin | Standard Liège | KAA Gent | Free |
| 1 July 2021 | Julien De Sart | KV Kortrijk | KAA Gent | Free |
| 1 July 2021 | Andrew Hjulsager | KV Oostende | KAA Gent | Undisclosed |
| 1 July 2021 | Gianni Bruno | SV Zulte Waregem | KAA Gent | Undisclosed |
| 1 July 2021 | Christopher Operi | LB Châteauroux | KAA Gent | Undisclosed |
| 1 July 2021 | Mujaid Sadick | Deportivo de La Coruña | KRC Genk | Undisclosed |
| 1 July 2021 | Siemen Voet | Club Brugge | PEC Zwolle | Undisclosed |
| 1 July 2021 | Grégory Grisez | K Beerschot VA | CS Fola Esch | Free |
| 1 July 2021 | Leon Kreković | HNK Hajduk Split | K Beerschot VA | Undisclosed |
| 1 July 2021 | Wesley Hoedt | Southampton FC | RSC Anderlecht | Undisclosed |
| 1 July 2021 | Colin Coosemans | KAA Gent | RSC Anderlecht | Free |
| 1 July 2021 | Michael Frey | Fenerbahçe S.K. | R Antwerp FC | Undisclosed |
| 1 July 2021 | Björn Engels | Aston Villa FC | R Antwerp FC | Undisclosed |
| 1 July 2021 | Abderahmane Soussi | Royale Union Saint-Gilloise | R Antwerp FC | Undisclosed |
| 1 July 2021 | Denis Prychynenko | K Beerschot VA | K.M.S.K. Deinze | Free |
| 1 July 2021 | Zech Medley | Arsenal FC | KV Oostende | Undisclosed |
| 1 July 2021 | Joseph Okumu | IF Elfsborg | KAA Gent | Undisclosed |
| 1 July 2021 | Amine Khammas | Waasland-Beveren | Apollon Limassol FC | Undisclosed |
| 1 July 2021 | Aboubakary Koita | Waasland-Beveren | Sint-Truidense V.V. | Undisclosed |
| 1 July 2021 | Siebren Lathouwers | Sint-Truidense V.V. | Belisia SV | Undisclosed |
| 1 July 2021 | Erwin Senakuku | RWDM47 | UR Namur | Undisclosed |
| 1 July 2021 | Zinho Gano | KRC Genk | SV Zulte Waregem | Undisclosed |
| 1 July 2021 | Thibault De Smet | Stade de Reims | K Beerschot VA | Loan |
| 1 July 2021 | Lorenzo Paolucci | Reggina 1914 | Royale Union Saint-Gilloise | Undisclosed |
| 1 July 2021 | Vaso Vasic | Royal Excel Mouscron | FC Luzern | Undisclosed |
| 1 July 2021 | Sergio Gomez | Borussia Dortmund | RSC Anderlecht | Undisclosed |
| 1 July 2021 | Taylor Harwood-Bellis | Manchester City | RSC Anderlecht | Loan |
| 1 July 2021 | Carel Eiting | AFC Ajax | KRC Genk | Undisclosed |
| 1 July 2021 | Vinicius Souza | Lommel S.K. | KV Mechelen | Loan |
| 1 July 2021 | Adem Zorgane | Paradou AC | RSC Charleroi | Undisclosed |
| 1 July 2021 | Knowledge Musona | RSC Anderlecht | Al-Tai FC | Undisclosed |
| 1 July 2021 | Manfred Ugalde | Lommel S.K. | FC Twente | Loan |
| 1 July 2021 | Marlos Moreno | Manchester City | KV Kortrijk | Loan |
| 1 July 2021 | Kelvin John | Brooke House Football Academy | KRC Genk | Undisclosed |
| 1 July 2021 | Samuel Asamoah | Sint-Truidense V.V. | FC U Craiova 1948 | Free |
| 1 July 2021 | Formose Mendy | Club Brugge KV | Amiens SC | Undisclosed |
| 1 July 2021 | Apostolos Konstantopoulos | Panetolikos F.C. | K Beerschot VA | Undisclosed |
| 1 July 2021 | Jelle Bataille | KV Oostende | R Antwerp FC | Undisclosed |
| 1 July 2021 | Samuel Gouet | SC Rheindorf Altach | KV Mechelen | Undisclosed |
| 1 July 2021 | Rémy Descamps | R. Charleroi S.C. | FC Nantes | Undisclosed |
| 1 July 2021 | Peter Žulj | RSC Anderlecht | İstanbul Başakşehir F.K. | Undisclosed |
| 1 July 2021 | Abraham Okyere | International Allies F.C. | K Beerschot VA | Undisclosed |
| 1 July 2021 | Jean Thierry Lazare | R. Charleroi S.C. | Royale Union Saint-Gilloise | Loan |
| 1 July 2021 | Emmanuel Dennis | Club Brugge KV | Watford F.C. | Undisclosed |
| 1 July 2021 | Arnold Garita | RSC Charleroi | Football Bourg-en-Bresse Péronnas 01 | Undisclosed |
| 1 July 2021 | Daniel Maderner | SC Rheindorf Altach | Waasland-Beveren | Undisclosed |
| 2 July 2021 | Waldo Rubio | Real Valladolid | Cercle Brugge | Loan |
| 2 July 2021 | Felipe Avenatti | Standard Liège | Royale Union Saint-Gilloise | Loan |
| 3 July 2021 | Sava Petrov | KVC Westerlo | NK Olimpija | Undisclosed |
| 3 July 2021 | Yan Vorogovsky | K Beerschot VA | FC Kairat | Free |
| 3 July 2021 | Andy King | OH Leuven | Bristol City | Free |
| 4 July 2021 | David Sousa | Botafogo FR | Cercle Brugge | Loan |
| 4 July 2021 | Michel-Ange Balikwisha | Standard Liège | R Antwerp FC | Undisclosed |
| 5 July 2021 | Trova Boni | KV Mechelen | Belenenses SAD | Free |
| 5 July 2021 | Franck Koré | RE Virton | FC Swift Hesperange | Free |
| 5 July 2021 | Junior Sambu Marsoni | SO Cholet | R.F.C. Seraing (1922) | Free |
| 5 July 2021 | Dino Arslanagić | KAA Gent | Göztepe S.K. | Undisclosed |
| 6 July 2021 | Franko Andrijašević | KAA Gent | Zhejiang Professional F.C. | Undisclosed |
| 6 July 2021 | Aldom Deuro | Cercle Brugge | LB Châteauroux | Loan |
| 6 July 2021 | Hervé Koffi | Lille OSC | RSC Charleroi | Undisclosed |
| 6 July 2021 | Cenk Özkacar | Olympique Lyon | OH Leuven | Loan |
| 6 July 2021 | Naïm Boujouh | RWDM47 | K.F.C. Dessel Sport | Free |
| 6 July 2021 | Yassine Ben Hamed | Lille OSC | R Antwerp FC | Undisclosed |
| 6 July 2021 | Alexis Gonçalves | LB Châteauroux | RWDM47 | Undisclosed |
| 7 July 2021 | Damien Marcq | SV Zulte Waregem | Royale Union Saint-Gilloise | Free |
| 7 July 2021 | Mike Trésor | Willem II | KRC Genk | Undisclosed |
| 7 July 2021 | Martin Hongla | R Antwerp FC | Hellas Verona F.C. | Loan |
| 8 July 2021 | Scotty Sadzoute | Lille OSC | OH Leuven | Undisclosed |
| 8 July 2021 | Jesaja Herrmann | VfL Wolfsburg | KV Kortrijk | Loan |
| 8 July 2021 | Niklas Dorsch | KAA Gent | FC Augsburg | Undisclosed |
| 9 July 2021 | Marius Mouandilmadji | Free Agent | R.F.C. Seraing (1922) | Free |
| 9 July 2021 | Vakoun Issouf Bayo | Celtic FC | KAA Gent | Undisclosed |
| 9 July 2021 | Dinis Almeida | PFC Lokomotiv Plovdiv | R Antwerp FC | Free |
| 10 July 2021 | Alireza Beiranvand | R Antwerp FC | Boavista F.C. | Loan |
| 12 July 2021 | Théo Defourny | K.A.S. Eupen | RWDM47 | Undisclosed |
| 13 July 2021 | Dieumerci Mbokani | R Antwerp FC | Kuwait SC | Free |
| 13 July 2021 | Jérôme Déom | MVV Maastricht | K.A.S. Eupen | Undisclosed |
| 13 July 2021 | Clément Tainmont | Free Agent | Royal Excel Mouscron | Free |
| 13 July 2021 | Zinho Vanheusden | Standard Liège | Inter Milan | Undisclosed |
| 14 July 2021 | Deni Hočko | Royal Excel Mouscron | Pafos FC | Undisclosed |
| 14 July 2021 | Ethan Horvath | Club Brugge | Nottingham Forest F.C. | Free |
| 15 July 2021 | Lyle Foster | Vitória S.C. | KVC Westerlo | Loan |
| 15 July 2021 | Eddy Sylvestre | Standard Liège | Pau FC | Loan |
| 15 July 2021 | Ruben Geeraerts | R Antwerp FC | KMSK Deinze | Undisclosed |
| 15 July 2021 | Jellert Van Landschoot | Lierse Kempenzonen | Helmond Sport | Undisclosed |
| 15 July 2021 | Benito Raman | FC Schalke 04 | RSC Anderlecht | Undisclosed |
| 15 July 2021 | Yari Stevens | Club Brugge | KAA Gent | Undisclosed |
| 15 July 2021 | Morgan Poaty | EA Guingamp | R.F.C. Seraing (1922) | Free |
| 16 July 2021 | Dries Wouters | KRC Genk | FC Schalke 04 | Free |
| 16 July 2021 | Alhassan Yusuf | IFK Göteborg | R Antwerp FC | Undisclosed |
| 17 July 2021 | Ivan Fiolić | KRC Genk | NK Osijek | Free |
| 19 July 2021 | Ambroise Gboho | KVC Westerlo | FC Chambly | Free |
| 19 July 2021 | Albert Sambi Lokonga | RSC Anderlecht | Arsenal FC | Undisclosed |
| 19 July 2021 | Ognjen Vranješ | RSC Anderlecht | AEK Athens | Undisclosed |
| 19 July 2021 | Youssef Maziz | FC Metz | R.F.C. Seraing (1922) | Loan |
| 19 July 2021 | Jere Uronen | KRC Genk | Stade Brestois 29 | Undisclosed |
| 20 July 2021 | Alfons Amade | TSG 1899 Hoffenheim | KV Oostende | Free |
| 20 July 2021 | Parfait Mandanda | R. Charleroi S.C. | Royal Excel Mouscron | Free |
| 20 July 2021 | Sébastien Dewaest | KRC Genk | OH Leuven | Loan |
| 20 July 2021 | Boris Popovic | AS Monaco FC | Cercle Brugge | Undisclosed |
| 20 July 2021 | Edgaras Utkus | AS Monaco FC | Cercle Brugge | Undisclosed |
| 21 July 2021 | Kristoffer Olsson | FC Krasnodar | RSC Anderlecht | Undisclosed |
| 21 July 2021 | Odilon Kossounou | Club Brugge | Bayer Leverkusen | Undisclosed |
| 22 July 2021 | Roman Ferber | Royale Union Saint-Gilloise | Royal FC Mandel United | Undisclosed |
| 22 July 2021 | Cristopher Fiermarin | Montevideo City Torque | Lommel S.K. | Loan |
| 23 July 2021 | Michael Krmenčík | Club Brugge | SK Slavia Prague | Loan |
| 23 July 2021 | Nik Lorbek | Royale Union Saint-Gilloise | NŠ Mura | Undisclosed |
| 23 July 2021 | Mitchy Ntelo | Standard Liège | MVV Maastricht | Loan |
| 23 July 2021 | Lucas Kalala | Standard Liège | MVV Maastricht | Loan |
| 23 July 2021 | Allan Delferrière | Standard Liège | MVV Maastricht | Loan |
| 23 July 2021 | Aron Dønnum | Vålerenga Fotball | Standard Liège | Undisclosed |
| 23 July 2021 | Dylan Batubinsika | R Antwerp FC | F.C. Famalicão | Undisclosed |
| 24 July 2021 | Stanley Nsoki | OGC Nice | Club Brugge | Undisclosed |
| 26 July 2021 | Obbi Oulare | Standard Liège | Barnsley F.C. | Undisclosed |
| 27 July 2021 | Manuel Angiulli | MVV Maastricht | Royal Excel Mouscron | Free |
| 27 July 2021 | Ivan Goranov | R. Charleroi S.C. | PFC Levski Sofia | Loan |
| 29 July 2021 | Thierry Ambrose | FC Metz | KV Oostende | Undisclosed |
| 29 July 2021 | Joachim Carcela | Standard Liège | Royal Excel Mouscron | Free |
| 29 July 2021 | Kanu | Sociedade Desportiva Juazeirense | K. Rupel Boom F.C. | Free |
| 29 July 2021 | Tibo Persyn | Inter Milan | Club Brugge | Loan |
| 30 July 2021 | Viktor Fischer | F.C. Copenhagen | R Antwerp FC | Undisclosed |
| 30 July 2021 | Romain Matthys | K.A.S. Eupen | MVV Maastricht | Loan |
| 30 July 2021 | Simon Libert | K.A.S. Eupen | MVV Maastricht | Loan |
| 30 July 2021 | Marciano Aziz | K.A.S. Eupen | MVV Maastricht | Loan |
| 31 July 2021 | Keres Masangu | K Beerschot VA | RE Virton | Free |
| 31 July 2021 | Din Sula | Waasland Beveren | RE Virton | Free |
| 31 July 2021 | Euloge Placca Fessou | K Beerschot VA | Al Tadhamon SC | Loan |
| 31 July 2021 | Abdel Al Badaoui | R.F.C. Seraing (1922) | AD Alcorcón | Free |
| 31 July 2021 | Roman Yaremchuk | KAA Gent | S.L. Benfica | Undisclosed |
| 31 July 2021 | Jacob Montes | Crystal Palace | Waasland Beveren | Loan |
| 1 August 2021 | Stefan Milosevic | Waasland-Beveren | Hapoel Ironi Kiryat Shmona F.C. | Undisclosed |
| 2 August 2021 | Jonas Vinck | Unattached | R.E. Virton | Free |
| 2 August 2021 | Timothy Martin | Nîmes Olympique | R.E. Virton | Undisclosed |
| 2 August 2021 | Aimery Pinga | FC Sion | R.E. Virton | Undisclosed |
| 2 August 2021 | Maxim De Cuyper | Club Brugge KV | K.V.C. Westerlo | Loan |
| 2 August 2021 | Ján Bernát | MŠK Žilina | K.V.C. Westerlo | Loan |
| 2 August 2021 | Kévin Hoggas | Cercle Brugge K.S.V. | Waasland-Beveren | Undisclosed |
| 2 August 2021 | Mamoutou N'Diaye | CD Marino | K.V.C. Westerlo | Undisclosed |
| 3 August 2021 | Rocco Reitz | Borussia Mönchengladbach | Sint-Truidense V.V. | Loan |
| 3 August 2021 | Dylan Mbayo | K.A.A. Gent | K.V. Kortrijk | Undisclosed |
| 3 August 2021 | Alieu Fadera | FK Pohronie | S.V. Zulte Waregem | Undisclosed |
| 4 August 2021 | Joshua Zirkzee | FC Bayern Munich | R.S.C. Anderlecht | Loan |
| 4 August 2021 | Kaveh Rezaei | Club Brugge KV | OH Leuven | Undisclosed |
| 4 August 2021 | Victor Wernersson | K.V. Mechelen | Stabæk Fotball | Loan |
| 4 August 2021 | Adrien Giunta | Standard Liège | Royal Excel Mouscron | Undisclosed |
| 5 August 2021 | Sam Vines | Colorado Rapids | Royal Antwerp F.C. | Undisclosed |
| 5 August 2021 | Johannes Eggestein | SV Werder Bremen | Royal Antwerp F.C. | Undisclosed |
| 5 August 2021 | Anas Hamzaoui | Royale Union Saint-Gilloise | RE Virton | Undisclosed |
| 5 August 2021 | Jamal Aabbou | Lommel SK | RE Virton | Undisclosed |
| 5 August 2021 | Ayyoub Allach | Lierse Kempenzonen | RE Virton | Undisclosed |
| 5 August 2021 | Jad Mouaddib | FCV Farul Constanța | RE Virton | Undisclosed |
| 5 August 2021 | Joris Ahlinvi | Unattached | RE Virton | Free |
| 5 August 2021 | Paulo Napoletano | Parma Calcio | RE Virton | Undisclosed |
| 6 August 2021 | Issa Soumaré | US Orléans | K Beerschot VA | Undisclosed |
| 6 August 2021 | David Atanga | Holstein Kiel | KV Oostende | Undisclosed |
| 6 August 2021 | Sivert Heltne Nilsen | Waasland Beveren | SK Brann | Undisclosed | |
| 7 August 2021 | Neto Borges | KRC Genk | C.D. Tondela | Loan |
| 7 August 2021 | Fernand Gouré | Maccabi Netanya F.C. | KVC Westerlo | Undisclosed |
| 7 August 2021 | Brahim Sabaouni | R.F.C. Seraing | FAR Rabbat | Undisclosed |
| 7 August 2021 | Anthony Sadin | RWDM47 | RE Virton | Undisclosed |
| 8 August 2021 | Daichi Hayashi | Sagan Tosu | Sint-Truidense V.V. | Undisclosed |
| 8 August 2021 | Ruben Droehnlé | FK Teplice | RE Virton | Free |
| 8 August 2021 | Nicholas Rizzo | Genoa C.F.C. | RE Virton | Loan |
| 9 August 2021 | Aron Sigurðarson | Royale Union Saint-Gilloise | AC Horsens | Undisclosed |
| 9 August 2021 | Anderson Niangbo | KAA Gent | SK Sturm Graz | Loan |
| 9 August 2021 | Rabbi Matondo | FC Schalke 04 | Cercle Brugge | Loan |
| 9 August 2021 | Leroy Labylle | R.F.C. Seraing (1904) | MVV Maastricht | Free |
| 10 August 2021 | Michel Vlap | RSC Anderlecht | FC Twente | Loan |
| 10 August 2021 | Kaoru Mitoma | Brighton & Hove Albion | Royale Union Saint-Gilloise | Loan |
| 10 August 2021 | Jhonny Lucas | Sint-Truidense V.V. | Londrina Esporte Clube | Loan |
| 10 August 2021 | Loïc Ritière | KV Kortrijk | Royal FC Mandel United | Free |
| 10 August 2021 | Nihad Mujakić | KV Kortrijk | Waasland Beveren | Loan |
| 10 August 2021 | Benjamin Van Durmen | Royal Excel Mouscron | FC U Craiova 1948 | Undisclosed |
| 11 August 2021 | Yevhenii Makarenko | RSC Anderlecht | Fehérvár FC | Undisclosed |
| 11 August 2021 | Lawrence Shankland | Dundee United F.C. | K Beerschot VA | Undisclosed |
| 11 August 2021 | Herdi Bukusu | Hamburg SV | RE Virton | Undisclosed |
| 11 August 2021 | Noah Awassi | FC Schalke 04 | RE Virton | Undisclosed |
| 11 August 2021 | Lucas Ribeiro Costa | R. Charleroi S.C. | Royal Excel Mouscron | Loan |
| 11 August 2021 | Jason Bourdouxhe | FC Eindhoven | Royal Excel Mouscron | Free |
| 11 August 2021 | Frédéric Duplus | OH Leuven | Royal Excel Mouscron | Free |
| 11 August 2021 | Calvin Dekuyper | Cercle Brugge | Royal Excel Mouscron | Free |
| 11 August 2021 | Eden Shamir | Standard Liège | Maccabi Tel Aviv F.C. | Loan |
| 12 August 2021 | Milan Tučić | OH Leuven | Hokkaido Consadole Sapporo | Undisclosed |
| 12 August 2021 | Femi Seriki | Sheffield United F.C. | K Beerschot VA | Loan |
| 12 August 2021 | Marc Olivier Doue | PEC Zwolle | RE Virton | Free |
| 12 August 2021 | Abdelkahar Kadri | Paradou AC | KV Kortrijk | Undisclosed |
| 12 August 2021 | David Okereke | Club Brugge | Venezia F.C. | Loan |
| 12 August 2021 | Osman Bukari | KAA Gent | FC Nantes | Loan |
| 13 August 2021 | Thomas Van den Keybus | Club Brugge | KVC Westerlo | Loan |
| 13 August 2021 | Álex Millán | Villarreal CF | Cercle Brugge | Loan |
| 14 August 2021 | Radja Nainggolan | Inter Milan | R Antwerp FC | Free |
| 14 August 2021 | Gaëtan Hendrickx | R. Charleroi S.C. | K.M.S.K. Deinze | Undisclosed |
| 16 August 2021 | Altin Kryeziu | Torino F.C. | RE Virton | Loan |
| 16 August 2021 | Imad Faraj | Royal Excel Mouscron | AEK Larnaca FC | Undisclosed |
| 17 August 2021 | Vincent Koziello | 1. FC Köln | KV Oostende | Free |
| 18 August 2021 | Timon Wellenreuther | RSC Anderlecht | Willem II | Loan |
| 18 August 2021 | Hamza Rafia | Juventus FC | Standard Liège | Loan |
| 19 August 2021 | Daouda Peeters | Juventus FC | Standard Liège | Loan |
| 19 August 2021 | Serge Tabekou | Royal Excel Mouscron | Manisa FK | Loan |
| 19 August 2021 | Francis Junior Zé | Royal Excel Mouscron | R.F.C. Tournai | Free |
| 19 August 2021 | Alan Gyde | Royal Excel Mouscron | R.F.C. Tournai | Free |
| 20 August 2021 | Owen Otasowie | Wolverhampton Wanderers F.C. | Club Brugge | Undisclosed |
| 20 August 2021 | Ruben Providence | A.S. Roma | Club Brugge | Loan |
| 20 August 2021 | Daniel Arzani | Manchester City | Lommel S.K. | Loan |
| 20 August 2021 | Artuur Zutterman | Cercle Brugge | Royal FC Mandel United | Undisclosed |
| 21 August 2021 | Valentine Ozornwafor | Galatasaray S.K. | R. Charleroi S.C. | Loan |
| 21 August 2021 | Christian Kouamé | ACF Fiorentina | RSC Anderlecht | Loan |
| 22 August 2021 | Alexis De Sart | R Antwerp FC | OH Leuven | Loan |
| 23 August 2021 | Taichi Hara | Deportivo Alavés | Sint-Truidense V.V. | Undisclosed |
| 24 August 2021 | Ramiro Vaca | The Strongest | K Beerschot VA | Undisclosed |
| 24 August 2021 | Thomas Henry | OH Leuven | Venezia F.C. | Undisclosed |
| 24 August 2021 | Michael Clinton Opeyemi | Vålerenga Fotball | Club Brugge | Undisclosed |
| 24 August 2021 | Darko Lemajić | FK RFS | KAA Gent | Undisclosed |
| 24 August 2021 | Ike Ugbo | Chelsea FC | KRC Genk | Undisclosed |
| 24 August 2021 | Gaël Kakudji | R.F.C. Seraing (1922) | R. Olympic Charleroi | Free |
| 25 August 2021 | Ismaël Sow | FC Girondins de Bordeaux | Royal Excel Mouscron | Loan |
| 25 August 2021 | Dereck Kutesa | Stade de Reims | SV Zulte Waregem | Loan |
| 25 August 2021 | Eduards Daškevičs | RSC Anderlecht | Hamarkameratene | Free |
| 25 August 2021 | Adel Bourard | R.F.C. Seraing (1922) | RRC Stockay-Warfusée | Free |
| 26 August 2021 | Arthur Theate | KV Oostende | Bologna F.C. 1909 | Loan |
| 26 August 2021 | Steve Yanken | Standard Liège | Cagliari Calcio | Free |
| 26 August 2021 | Karim Zedadka | S.S.C. Napoli | R. Charleroi S.C. | Loan |
| 26 August 2021 | Dario Del Fabro | Juventus FC | R.F.C. Seraing (1904) | Loan |
| 27 August 2021 | Dorian Dessoleil | R. Charleroi S.C. | Royal Antwerp F.C. | Undisclosed |
| 27 August 2021 | Pierre Dwomoh | K.R.C. Genk | Royal Antwerp F.C. | Undisclosed |
| 27 August 2021 | Sofian Chakla | Villarreal CF | OH Leuven | Free |
| 27 August 2021 | Jesse Sekidika | Galatasaray S.K. | OH Leuven | Loan |
| 27 August 2021 | Kamal Sowah | Leicester City | Club Brugge | Undisclosed |
| 27 August 2021 | Oğuz Kağan Güçtekin | Fenerbahçe S.K. | KVC Westerlo | Loan |
| 27 August 2021 | Erdon Daci | Konyaspor | KVC Westerlo | Loan |
| 28 August 2021 | Wesley Moraes | Aston Villa | Club Brugge | Loan |
| 28 August 2021 | Simon Deli | Club Brugge | Adana Demirspor | Undisclosed |
| 28 August 2021 | Elias Cobbaut | RSC Anderlecht | Parma Calcio 1913 | Loan |
| 28 August 2021 | Joseph Nonge Boende | RSC Anderlecht | Juventus FC | Undisclosed |
| 28 August 2021 | Ibrahima Bah | Royale Union Saint-Gilloise | Racing de Santander | Undisclosed |
| 29 August 2021 | Maximiliano Caufriez | Sint-Truidense V.V. | FC Spartak Moscow | Undisclosed |
| 29 August 2021 | Sofiane Bouzian | KV Mechelen | K.V.K. Tienen | Free |
| 30 August 2021 | Houssen Abderrahmane | RWDM47 | Francs Borains | Free |
| 30 August 2021 | Bryan Limbombe | KRC Genk | Roda JC Kerkrade | Undisclosed |
| 30 August 2021 | Dario Van den Buijs | K Beerschot VA | RKC Waalwijk | Undisclosed |
| 30 August 2021 | Youssouph Badji | Club Brugge | Stade Brestois 29 | Loan |
| 30 August 2021 | Glody Likonza | TP Mazembe | Standard Liège | Loan |
| 30 August 2021 | Jordan Attah Kadiri | Lommel S.K. | Strømsgodset Toppfotball | Loan |
| 31 August 2021 | Nikola Pejčić | Waasland-Beveren | Francs Borains | Free |
| 31 August 2021 | Frank Boya | Royal Antwerp F.C. | SV Zulte Waregem | Loan |
| 31 August 2021 | Teddy Chevalier | KV Kortrijk | Royal Excel Mouscron | Undisclosed |
| 31 August 2021 | Rachid Alioui | Angers SCO | KV Kortrijk | Undisclosed |
| 31 August 2021 | Didier Desprez | Paris FC | RSC Charleroi | Undisclosed |
| 31 August 2021 | Chris Kalulika | RSC Anderlecht | KV Mechelen | Free |
| 31 August 2021 | Anas Nanah | Mohammed VI Football Academy | K.A.S. Eupen | Loan |
| 31 August 2021 | Mohammed Essahel | Mohammed VI Football Academy | K.A.S. Eupen | Loan |
| 31 August 2021 | Lisandro Magallán | AFC Ajax | RSC Anderlecht | Loan |
| 31 August 2021 | Ilombe Mboyo | Sint-Truidense V.V. | KAA Gent | Undisclosed |
| 31 August 2021 | Stéphane Mukala | Standard Liège | UR La Louvière Centre | Free |
| 31 August 2021 | Amine Ghazoini | Ascoli Calcio | RE Virton | Loan |
| 31 August 2021 | Ibrahim Karamoko | Torino F.C. | RE Virton | Loan |
| 31 August 2021 | Nader Ghandri | K.V.C. Westerlo | Club Africain | Undisclosed |
| 31 August 2021 | Fabien Antunes | K.V.C. Westerlo | Panetolikos F.C. | Free |
| 31 August 2021 | Yan Bouché | Racing FC Union Luxembourg | Royal Excel Mouscron | Undisclosed |
| 31 August 2021 | Jossue Dolet | KV Mechelen | Helmond Sport | Loan |
| 31 August 2021 | Senne Ceulemans | KV Mechelen | K.V.V. Thes Sport Tessenderlo | Loan |
| 31 August 2021 | Loïc Bessilé | FC Girondins de Bordeaux | RSC Charleroi | Undisclosed |
| 31 August 2021 | Kader Keïta | K.V.C. Westerlo | FC Sion | Loan |
| 31 August 2021 | Alexandre Ippolito | Royal Excel Mouscron | FC Wiltz 71 | Free |
| 31 August 2021 | Saido Berahino | SV Zulte Waregem | Sheffield Wednesday F.C. | Undisclosed |
| 31 August 2021 | Mohammed Dauda | RSC Anderlecht | FC Cartagena | Loan |
| 31 August 2021 | Mustapha Bundu | RSC Anderlecht | Aarhus Gymnastikforening | Loan |
| 31 August 2021 | Luka Adžić | RSC Anderlecht | PEC Zwolle | Free |
| 31 August 2021 | Deart Bajraktari | R.F.C. Seraing (1922) | RFC Meux | Free |
| 31 August 2021 | Moussa Gueye | R.F.C. Seraing (1922) | URSL Visé | Free |
| 31 August 2021 | Aristote Nkaka | RSC Anderlecht | Waasland-Beveren | Loan |
| 31 August 2021 | Stephen Odey | KRC Genk | Randers FC | Loan |
| 31 August 2021 | Sory Kaba | FC Midtjylland | OH Leuven | Loan |
| 31 August 2021 | Thomas Touré | Angers SCO | RE Virton | Free |
| 31 August 2021 | Yanis Castagne | CD Castellón | RE Virton | Free |
| 31 August 2021 | Jonah Osabutey | SV Werder Bremen | KV Kortrijk | Undisclosed |
| 31 August 2021 | Niels Nkounkou | Everton F.C. | Standard Liège | Loan |
| 31 August 2021 | Antonio Nusa | Stabæk Fotball | Club Brugge | Undisclosed |
| 31 August 2021 | José Izquierdo | Brighton & Hove Albion | Club Brugge | Free |
| 31 August 2021 | Steven Fortès | RC Lens | KV Oostende | Loan |
| 31 August 2021 | Faitout Maouassa | Stade Rennais F.C. | Club Brugge | Undisclosed |
| 31 August 2021 | William Togui | KV Mechelen | RWDM47 | Loan |
| 31 August 2021 | Jack Hendry | KV Oostende | Club Brugge | Undisclosed |
| 31 August 2021 | Aboubakar Keita | RSC Charleroi | RWDM47 | Loan |
| 31 August 2021 | Billel Messaoudi | JS Saoura | KV Kortrijk | Loan |
| 31 August 2021 | Idrissa Doumbia | Sporting CP | SV Zulte Waregem | Loan |
| 31 August 2021 | Souleymane Anne | C.D. Tondela | RE Virton | Free |
| 31 August 2021 | Mbwana Samatta | Fenerbahçe S.K. | Royal Antwerp F.C. | Loan |
| 31 August 2021 | Victor Torp | FC Midtjylland | KV Kortrijk | Loan |
| 31 August 2021 | Brice Verkerken | KV Kortrijk | S.C. Eendracht Aalst | Loan |
| 31 August 2021 | Louis Verstraete | Royal Antwerp F.C. | Waasland-Beveren | Undisclosed |
| 31 August 2021 | Preben Stiers | KV Oostende | FC Den Bosch | Loan |
| 31 August 2021 | Mohamed Berte | KV Oostende | FC Den Bosch | Loan |
| 31 August 2021 | Mathieu De Smet | SV Zulte Waregem | TOP Oss | Loan |
| 31 August 2021 | Malick Keita | KV Oostende | Sint-Truidense V.V. | Free |
| 31 August 2021 | Jo Gilis | OH Leuven | K.S.K. Heist | Loan |
| 31 August 2021 | Alexander Quadflieg | KV Mechelen | K.S.K. Heist | Free |
| 31 August 2021 | Reian Meddour | RWDM47 | K.S.K. Heist | Free |
| 31 August 2021 | Bob Desmet | KV Kortrijk | F.C. Gullegem | Free |
| 31 August 2021 | Rúnar Alex Rúnarsson | Arsenal FC | OH Leuven | Loan |
| 31 August 2021 | Mykola Kukharevych | ES Troyes AC | OH Leuven | Loan |
| 31 August 2021 | Moisés Caicedo | Brighton & Hove Albion | K Beerschot VA | Loan |
| 31 August 2021 | Mauricio Lemos | Fenerbahçe S.K. | K Beerschot VA | Loan |
| 31 August 2021 | Cyriel Dessers | KRC Genk | Feyenoord | Loan |
| 31 August 2021 | Amadou Sagna | Club Brugge | Stade Briochin | Loan |
| 31 August 2021 | Matías Silvestre | Royal Excel Mouscron | Virtus Entella | Loan |
| 1 Sep 2021 | Blessing Eleke | K Beerschot VA | Gençlerbirliği S.K. | Loan |
| 1 Sep 2021 | Basilio Ndong | K.V.C. Westerlo | IK Start | Loan |
| 1 Sep 2021 | Alimami Gory | Cercle Brugge | Paris FC | Loan |
| 2 Sep 2021 | Enes Sağlık | Royal Excel Mouscron | Menemenspor | Free |
| 2 Sep 2021 | Halim Timassi | Free Agent | Royale Union Saint-Gilloise | Free |
| 2 Sep 2021 | Lucas Defise | Free Agent | Royale Union Saint-Gilloise | Free |
| 3 Sep 2021 | Toni Leistner | Free Agent | Sint-Truidense V.V. | Free |
| 6 Sep 2021 | Thomas Robert | Free Agent | Royal Excel Mouscron | Free |
| 6 Sep 2021 | Kenny Saief | RSC Anderlecht | F.C. Ashdod | Undisclosed |
| 6 Sep 2021 | Didier Lamkel Zé | Royal Antwerp F.C. | FC DAC 1904 Dunajská Streda | Loan |
| 6 Sep 2021 | Alan Bidi | Free Agent | RE Virton | Free |
| 7 Sep 2021 | Robert Bauer | Free Agent | Sint-Truidense V.V. | Free |
| 7 Sep 2021 | Geronimo De Ridder | Free Agent | RE Virton | Free |