FC Basel U21: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-02 | Giacomo Koloto | FC Basel U21 | Basel | — |
| 2026-01-15 | Simon Caillet | FC Basel U21 | FC Sion | — |
| 2025-08-07 | Simon Caillet | FC Basel U21 | Concordia BS | Loan |
| 2025-07-22 | Demir Xhemalija | FC Basel U21 | FC Luzern | — |
| 2025-07-02 | Noah Streit | FC Basel U21 | Neuchâtel Xamax | Loan |
| 2025-07-01 | Simon Caillet | FC Basel U19 | FC Basel U21 | — |
| 2025-07-01 | Giacomo Koloto | FC Basel U17 | FC Basel U21 | — |
| 2024-09-26 | Tim Pfeiffer | FC Basel U21 | Basel | — |
| 2024-07-01 | Antonio Spagnoli | FC Basel U21 | FC Winterthur | Free |
| 2024-03-14 | Marvin Akahomen | FC Basel U21 | Basel | — |
| 2024-01-09 | Roméo Beney | FC Basel U21 | Basel | — |
| 2023-07-21 | Leon Avdullahu | FC Basel U21 | Basel | — |
| 2023-07-21 | Junior Zé | FC Basel U21 | Basel | — |
| 2023-07-21 | Axel Kayombo | FC Basel U21 | Basel | — |
| 2023-07-05 | Levin Winkler | FC Basel U21 | Luzern U21 | Free |
| 2023-07-01 | Noah Streit | FC Basel U18 | FC Basel U21 | — |
| 2023-07-01 | Marvin Akahomen | FC Basel U16 | FC Basel U21 | — |
| 2023-07-01 | Junior Zé | FC Basel U18 | FC Basel U21 | — |
| 2023-07-01 | Demir Xhemalija | FC Basel U18 | FC Basel U21 | — |
| 2023-07-01 | Carmine Chiappetta | FC Basel U21 | FC Winterthur | — |