Date | Player | Change |
|---|---|---|
| May 15 | Deactivated | |
| May 15 | Deactivated | |
| May 15 | Activated | |
| May 15 | Activated | |
| May 15 | Activated | |
| May 15 | Activated | |
| May 15 | Deactivated | |
| May 15 | Activated | |
| May 15 | Deactivated | |
| May 15 | Deactivated |
| Player | Injury | Status | Effective | |
|---|---|---|---|---|
| David Robertson (NYY - RP) | Left oblique strain | 15-day | May 15, 2012 | |
| Jon Jay (StL - OF) | Right shoulder sprain | 15-day | May 15, 2012 | |
| Sandy León (Was - C) | Sprained right ankle | 15-day | May 15, 2012 | |
| Jeff Niemann (TB - SP) | Fractured right leg - out 4-6 weeks | 15-day | May 15, 2012 | |
| Juan Uribe (LAD - 2B,3B) | Left wrist injury | 15-day | May 14, 2012 | |
| Danny Duffy (KC - SP) | Torn UCL, left elbow | 15-day | May 14, 2012 | |
| Matt Kemp (LAD - OF) | Strained left hamstring | 15-day | May 14, 2012 | |
| Wilson Ramos (Was - C) | Torn right ACL - out for season | 60-day | May 13, 2012 | |
| Carlos Mármol (ChC - RP) | Strained right hamstring | 15-day | May 12, 2012 | |
| Scott Rolen (Cin - 3B) | Strained left shoulder | 15-day | May 12, 2012 | |