Athletics Roster & Staff
Transactions
| Date | Transaction |
| 01/31/20 | Oakland Athletics signed free agent RHP Zac Reininger to a minor league contract. |
| 01/29/20 | Jorge Mateo changed number to 13. |
| 01/29/20 | Seth Brown changed number to . |
| 01/29/20 | Oakland Athletics signed free agent RHP Shohei Tomioka to a minor league contract. |
| 01/28/20 | Oakland Athletics signed free agent RHP Michael Ynoa to a minor league contract. |
| 01/14/20 | Oakland Athletics signed free agent LHP Jared Koenig to a minor league contract. |
| 01/13/20 | Chicago Cubs traded 2B Tony Kemp to Oakland Athletics for 1B Alfonso Rivas. |
| 01/13/20 | Chicago Cubs traded 2B Tony Kemp to Oakland Athletics for 1B Alfonso Rivas. |
| 01/08/20 | Oakland Athletics signed free agent C Ronnie Freeman to a minor league contract and invited him to spring training. |