| Date | Transaction | |||
| 5/31/04 | Activated DH Dmitri Young from the 15-day disabled list; placed C/1B Chris Shelton on the 15-day disabled list with plantar fasciitis of the right foot. | |||
| 5/23/04 | Sold the contract of nonroster RHP David Cortes to Tijuana of the Mexican League. | |||
| 5/18/04 | Signed RHP Jimmy Haynes to a minor-league contract. | |||
| 5/12/04 | Placed 2B Fernando Vina on the 15-day disabled list with a strained right hamstring; purchased the contract of IF Jason Smith from Triple-A Toledo; transferred RHP Lino Urdaneta from the 15-day DL to the 60-day DL. | |||
| 5/5/04 | Placed RHP Nate Cornejo on the 15-day disabled list, retroactive to May 3, with right shoulder inflammation. | |||
| Purchased the contract of RHP Craig Dingman from Triple-A Toledo. | ||||
| 5/1/04 | Released nonroster RHP Ariel Prieto. | |||
