| Date | Transaction | |||
| 7/28/04 | Signed LHP Jesus Sanchez to a minor league contract and assigned him to Triple-A Syracuse. | |||
| 7/25/04 | Recalled RHP Sean Douglass and RHP Mike Nakamura from Triple-A Syracuse. | |||
| 7/24/04 | traded RHP Terry Adams to the Boston Red Sox in exchange for minor league 3B John Hattig. | |||
| Blue Jays RHP Pat Hentgen announced his retirement. | ||||
| 7/22/04 | Transferred C Bobby Estalella from the 15-day to the 60-day disabled list; optioned RHP Bob File to Triple-A Syracuse and purchased the contract of RHP Kevin Frederick from Triple-A Syracuse. | |||
| 7/20/04 | Placed RHP Roy Halladay on the 15-day disabled list with right shoulder fatigue; activated OF Frank Catalanotto from the 15-day disabled list. | |||
| 7/16/04 | Activated OF Vernon Wells from the 15-day DL; Optioned OF Howie Clark to Triple-A Syracuse | |||
| 7/6/04 | Activated 1B Carlos Delgado from the DL; Optioned RHP Adam Peterson to Triple-A Syracuse. | |||
| 7/2/04 | Purchased the contract of RHP David Bush from Triple-A Syracuse; sent OF Simon Pond outright to Triple-A Syracuse. | |||
| 7/1/04 | Optioned RHP Micheal Nakamura to Triple-A Syracuse. | |||
