Tigers Roster & Staff
Transactions
| Date | Transaction |
| 07/31/21 | Detroit Tigers sent 1B Niko Goodrum on a rehab assignment to Toledo Mud Hens. |
| 07/30/21 | Detroit Tigers sent SS Isaac Paredes on a rehab assignment to Toledo Mud Hens. |
| 07/30/21 | Detroit Tigers traded LHP Daniel Norris to Milwaukee Brewers for RHP Reese Olson. |
| 07/30/21 | Detroit Tigers traded LHP Daniel Norris to Milwaukee Brewers for RHP Reese Olson. |
| 07/30/21 | Detroit Tigers selected the contract of LHP Ian Krol from Toledo Mud Hens. |
| 07/29/21 | Detroit Tigers sent LHP Ian Krol outright to Toledo Mud Hens. |
| 07/27/21 | Detroit Tigers designated LHP Ian Krol for assignment. |
| 07/27/21 | Detroit Tigers activated RHP Michael Fulmer. |
| 07/26/21 | Detroit Tigers signed RHP Dylan Smith. |
| 07/26/21 | Detroit Tigers signed 1B Justice Bigbie. |
| 07/26/21 | Detroit Tigers signed RHP Jack Anderson. |
| 07/23/21 | Detroit Tigers signed C Mike Rothenberg. |
| 07/23/21 | Detroit Tigers signed RHP Jackson Jobe. |
| 07/23/21 | Detroit Tigers signed OF Austin Schultz. |
| 07/23/21 | Detroit Tigers signed SS Izaac Pacheco. |
| 07/23/21 | Detroit Tigers signed 3B Chris Meyers. |
| 07/23/21 | Detroit Tigers signed RHP RJ Petit. |
| 07/22/21 | Detroit Tigers recalled SS Willi Castro from Toledo Mud Hens. |
| 07/22/21 | Detroit Tigers sent RHP Michael Fulmer on a rehab assignment to Toledo Mud Hens. |
| 07/22/21 | Detroit Tigers placed SS Isaac Paredes on the 10-day injured list. Right hip strain. |
| 07/22/21 | Detroit Tigers recalled SS Willi Castro. |
| 07/22/21 | Detroit Tigers recalled SS Willi Castro. |
| 07/21/21 | Detroit Tigers signed CF J.D. McLaughlin. |
| 07/21/21 | Detroit Tigers signed OF Ben Malgeri. |
| 07/21/21 | Detroit Tigers released RF Nomar Mazara. |
| 07/21/21 | Detroit Tigers optioned RHP Alex Lange to Toledo Mud Hens. |
| 07/21/21 | Detroit Tigers recalled RHP Matt Manning, and from Toledo Mud Hens. |
| 07/21/21 | Detroit Tigers signed RHP Blake Holub. |
| 07/20/21 | Detroit Tigers signed RHP Aaron Haase. |
| 07/20/21 | Detroit Tigers signed LHP Brant Hurter. |
| 07/20/21 | Detroit Tigers signed RHP Garrett Burhenn. |
| 07/19/21 | Detroit Tigers signed RHP Jordan Marks. |
| 07/19/21 | Detroit Tigers signed OF Austin Murr. |
| 07/19/21 | Detroit Tigers recalled C Grayson Greiner from Toledo Mud Hens. |
| 07/19/21 | Detroit Tigers placed C Jake Rogers on the 10-day injured list. Right arm soreness. |
| 07/19/21 | Detroit Tigers signed RHP Tanner Kohlhepp. |
| 07/19/21 | Detroit Tigers signed RHP Tyler Mattison. |
| 07/19/21 | Detroit Tigers signed RHP Ty Madden. |
| 07/18/21 | Detroit Tigers optioned LHP Miguel Del Pozo to Toledo Mud Hens. |
| 07/17/21 | Detroit Tigers recalled CF Victor Reyes from Toledo Mud Hens. |
| 07/17/21 | Detroit Tigers recalled RHP Alex Lange from Toledo Mud Hens. |
| 07/17/21 | RHP Will Vest returned to Detroit Tigers from Seattle Mariners. |
| 07/17/21 | Detroit Tigers placed RHP Jose Urena on the 10-day injured list. |
| 07/17/21 | Detroit Tigers placed 1B Niko Goodrum on the 10-day injured list. Left calf contusion. |
| 07/16/21 | Detroit Tigers recalled CF Derek Hill from Toledo Mud Hens. |
| 07/16/21 | Detroit Tigers recalled SS Isaac Paredes from Toledo Mud Hens. |
| 07/16/21 | Detroit Tigers designated RF Nomar Mazara for assignment. |
| 07/16/21 | Detroit Tigers optioned SS Willi Castro to Toledo Mud Hens. |
| 07/16/21 | Detroit Tigers recalled LHP Miguel Del Pozo from Toledo Mud Hens. |
| 07/10/21 | Detroit Tigers activated LHP Derek Holland. |
| 07/10/21 | Detroit Tigers optioned RHP Matt Manning to Toledo Mud Hens. |
| 07/08/21 | Detroit Tigers optioned CF Victor Reyes to Toledo Mud Hens. |
| 07/07/21 | Detroit Tigers activated 1B Niko Goodrum. |
| 07/07/21 | Detroit Tigers optioned RHP Alex Lange to Toledo Mud Hens. |
| 07/07/21 | Detroit Tigers placed RHP Spencer Turnbull on the 60-day injured list. Right forearm strain. |
| 07/07/21 | Detroit Tigers placed CF Daz Cameron on the 10-day injured list. Right toe sprain. |
| 07/07/21 | Detroit Tigers optioned RHP Bryan Garcia to Toledo Mud Hens. |
| 07/07/21 | Detroit Tigers selected the contract of LHP Ian Krol from Toledo Mud Hens. |
| 07/06/21 | Detroit Tigers sent RHP Alex Lange on a rehab assignment to Toledo Mud Hens. |
| 07/06/21 | Detroit Tigers sent LHP Derek Holland on a rehab assignment to Toledo Mud Hens. |
| 07/05/21 | Detroit Tigers sent CF Victor Reyes on a rehab assignment to Toledo Mud Hens. |
| 07/03/21 | Detroit Tigers sent 1B Niko Goodrum on a rehab assignment to Toledo Mud Hens. |
| 07/02/21 | Detroit Tigers activated RHP Erasmo Ramirez. |
| 07/01/21 | Detroit Tigers optioned CF Derek Hill to Toledo Mud Hens. |
| 07/01/21 | Detroit Tigers optioned LHP Miguel Del Pozo to Toledo Mud Hens. |