| 7/1/18 |
St. Louis Cardinals sent RHP Luke Gregerson on a rehab assignment to Memphis Redbirds. |
| 7/2/18 |
St. Louis Cardinals placed RF Dexter Fowler on the paternity list. |
| 7/2/18 |
St. Louis Cardinals recalled LF Tyler O'Neill from Memphis Redbirds. |
| 7/3/18 |
St. Louis Cardinals signed free agent 3B Malcom Nunez to a minor league contract. |
| 7/3/18 |
St. Louis Cardinals signed free agent RHP Victor Villanueva to a minor league contract. |
| 7/5/18 |
St. Louis Cardinals placed LF Tyler O'Neill on the 10-day disabled list. Left groin strain. |
| 7/5/18 |
St. Louis Cardinals activated RF Dexter Fowler from the paternity list. |
| 7/5/18 |
St. Louis Cardinals optioned RHP Matt Bowman to Memphis Redbirds. |
| 7/5/18 |
Philadelphia Phillies traded LHP Elniery Garcia to St. Louis Cardinals for Future Considerations. |
| 7/6/18 |
St. Louis Cardinals activated SS Paul DeJong from the 10-day disabled list. |
| 7/6/18 |
St. Louis Cardinals sent RHP Luke Gregerson on a rehab assignment to Springfield Cardinals. |
| 7/6/18 |
St. Louis Cardinals sent LHP Tyler Lyons on a rehab assignment to Memphis Redbirds. |
| 7/6/18 |
St. Louis Cardinals sent RHP Luke Gregerson on a rehab assignment to Memphis Redbirds. |
| 7/6/18 |
St. Louis Cardinals optioned LHP Austin Gomber to Memphis Redbirds. |
| 7/10/18 |
St. Louis Cardinals signed free agent RHP Ramon Fernandez to a minor league contract. |
| 7/11/18 |
St. Louis Cardinals sent LHP Tyler Lyons on a rehab assignment to Springfield Cardinals. |
| 7/13/18 |
St. Louis Cardinals activated LHP Tyler Lyons from the 10-day disabled list. |
| 7/13/18 |
St. Louis Cardinals activated RHP Luke Gregerson from the 10-day disabled list. |
| 7/13/18 |
St. Louis Cardinals optioned RHP Luke Weaver to Memphis Redbirds. |
| 7/13/18 |
St. Louis Cardinals optioned RHP John Brebbia to Memphis Redbirds. |
| 7/14/18 |
St. Louis Cardinals sent LF Tyler O'Neill on a rehab assignment to Memphis Redbirds. |
