| 2026-08-31 | A. Benedict | Doma United → FC Differdange 03 | Transfer |
| 2026-07-31 | C. Jean | Chateauroux → FC Differdange 03 | - |
| 2026-07-31 | A. Benedict | Dibba Al-Fujairah → FC Differdange 03 | Free agent |
| 2026-07-31 | I. Nabais | FC Differdange 03 → UD da Serra | Free agent |
| 2026-07-30 | C. Jean | Chateauroux → FC Differdange 03 | - |
| 2026-07-30 | A. Benedict | Dibba Al-Fujairah → FC Differdange 03 | Free agent |
| 2026-07-30 | I. Nabais | FC Differdange 03 → UD da Serra | Free agent |
| 2026-07-25 | J. Chaverra Palacios | FC Differdange 03 → Aragua FC | Free agent |
| 2026-07-23 | Edgar Pacheco | FC Differdange 03 → Atlético CP | Free agent |
| 2026-07-22 | Edgar Pacheco | FC Differdange 03 → Atlético CP | Free agent |
| 2026-07-01 | Gustavo Vintecinco | Centro Oeste → FC Differdange 03 | Free agent |
| 2026-06-30 | Mustapha Hadji | FC Differdange 03 → Progres Niederkorn | Free agent |
| 2026-06-30 | M. Grilo | União Santarém → FC Differdange 03 | Free agent |
| 2026-06-30 | T. Brusco | FC Differdange 03 → Boulogne | Transfer |
| 2026-06-30 | Gustavo Vintecinco | Centro Oeste → FC Differdange 03 | Free agent |
| 2026-06-30 | I. Nabais | UD da Serra → FC Differdange 03 | Free agent |
| 2026-06-30 | Simão Melhôr | Alpendorada → FC Differdange 03 | Free agent |
| 2026-06-30 | M. Mabuza | O Elvas → FC Differdange 03 | Free agent |
| 2026-06-29 | A. El Idrissi | Union Titus Petange → FC Differdange 03 | Return from loan |
| 2026-06-29 | Edgar Pacheco | FC Differdange 03 → Pacheco Edgar | Free agent |
| 2026-06-29 | Mustapha Hadji | FC Differdange 03 → Hadji Samir | Free agent |
| 2026-06-29 | Mustapha Hadji | FC Differdange 03 → Progres Niederkorn | Free agent |
| 2026-06-29 | L. Jakobi | FC Differdange 03 → Jakobi Luis | Free agent |
| 2026-06-29 | L. Jakobi | FC Differdange 03 → BSG Chemie Leipzig | Free agent |
| 2026-06-29 | D. Martins | Mondercange → FC Differdange 03 | Return from loan |
| 2026-06-29 | T. Brusco | FC Differdange 03 → Boulogne | Transfer |
| 2026-06-29 | E. Rivas | CD Olimpia → FC Differdange 03 | Free agent |
| 2026-06-29 | I. Nabais | UD da Serra → FC Differdange 03 | Free agent |
| 2026-06-29 | Simão Melhôr | Alpendorada → FC Differdange 03 | Free agent |
| 2026-06-29 | P. Costa | FC Differdange 03 → Naval 1893 | Free agent |
| 2026-06-27 | E. Rivas | CD Olimpia → FC Differdange 03 | Free agent |
| 2026-06-27 | S. Thill | Stal Rzeszów → FC Differdange 03 | Free agent |
| 2026-06-25 | J. Chaverra Palacios | Popayan → FC Differdange 03 | Free agent |
| 2026-02-21 | Ronaldo Camará | FC Differdange 03 → Banga | Free agent |
| 2026-02-20 | Ronaldo Camará | FC Differdange 03 → Banga | Free agent |
| 2026-01-31 | A. El Idrissi | FC Differdange 03 → Union Titus Petange | Loan |
| 2026-01-31 | J. Sampaio | Berco → FC Differdange 03 | Free agent |
| 2026-01-31 | P. Costa | Naval 1893 → FC Differdange 03 | Free agent |
30R. Da Silva CorreiaGoalkeeper · 19
1FelipeGoalkeeper · 42
99H. WolfGoalkeeper · 25
14J. BedouretDefender · 27
77G. BeiDefender · 30
4K. D'AnzicoDefender · 25
25G. FranzoniDefender · 34
66Pedro Gomes Ricciulli JoaoDefender · 26
42M. MabuzaDefender · 25
88Simão MelhôrDefender · 24
26F. MendesDefender · 18
16Marco GriloDefender · 32
24E. RivasDefender · 25
8Bruno ReisMidfielder · 26
77Leandro BorgesMidfielder · 34
88P. Mendes AlvesMidfielder · 20
20Rafael PintoMidfielder · 27
21L. RauchMidfielder · 25
17Marceu Soares DelgadoMidfielder · 16
31S. ThillMidfielder · 32
10A. AbreuAttacker · 31
70Andre MendyAttacker · 25
99A. BenedictAttacker · 23
9A. BuchAttacker · 32
95Gustavo VintecincoAttacker · 30
13C. JeanAttacker · 30
7A. MfoumouAttacker · 20