| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| M | Ibrahim El Ansri | 1997-01-10 | 2021-12-31 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 26.Jul | Ibrahim El Ansri (M) | Lierse SK | Dalkurd FF | Confirmed | |
| 30.Jun | Karim Hafez (D) | RC Lens | Lierse SK | Confirmed | |
| 31.Aug | Karim Hafez (D) | Lierse SK | RC Lens | Confirmed | |
| 30.Jun | Etien Velikonja (F) | Lierse SK | Cardiff City | Confirmed | |
| 20.Jul | Allasane-Méba Diaby (M) | AS Monaco FC | Lierse SK | Confirmed | |
| 26.Jan | Apostolos Vellios (F) | Lierse SK | FC Vestsjælland | Confirmed | |
| 8.Jan | Etien Velikonja (F) | Cardiff City | Lierse SK | Confirmed | |
| 19.May | Julien Vercauteren (M) | Lierse SK | OGC Nice | Confirmed | |
| 1.Sep | Tony Watt (F) | Celtic FC | Lierse SK | Confirmed | |
| 5.Jul | Soufiane Bidaoui (M) | Lierse SK | Parma FC | Confirmed |