(as of 8/26/21)
| No. | Name | Team | Pos. | Transaction |
|---|---|---|---|---|
| 2 | Alex Bregman | Houston Astros | INF | Opening Day Roster – Activated from IL (8/25) |
| 11 | Greg Deichmann | Chicago Cubs | OF | 40-Man Roster - Reassigned (8/15) (MLB Debut 8/6) |
| 28 | Jake Fraley | Seattle Mariners | CF | Opening Day Roster – Recalled (8/2) |
| 34 | Kevin Gausman | San Francisco Giants | P | Opening Day Starter - Placed on 10-Day IL (8/24) |
| 36 | Will Harris | Washington Nationals | P | 40-Man Roster – 60-day IL (6/12) |
| 21 | Jacoby Jones | Detroit Tigers | INF | 40-Man Roster – Reassigned to AAA (6/10) |
| 57 | Alex Lange | Detroit Tigers | P | 40-Man Roster – Recalled (8/22) (MLB Debut 4/10) |
| 26 | DJ LeMahieu | New York Yankees | 2B | Opening Day Roster |
| 27 | Aaron Nola | Philadelphia Phillies | P | Opening Day Roster |
| 26 | Austin Nola | San Diego Padres | C | 40-Man Roster – Activated from IL (7/22) |
| 46 | Riley Smith | Arizona Diamondbacks | P | 40-Man Roster – Placed on 60-day IL (8/22) |
| 17 | Andrew Stevenson | Washington Nationals | OF | 40-Man Roster – Recalled (8/31) |
Tigers on Spring Training Rosters - 2021
(as of 3/30/21)
| No. | Name | Team | Pos. | Transaction |
|---|---|---|---|---|
| 2 | Alex Bregman | Houston Astros | INF | 40-Man Roster |
| 31 | Greg Deichmann | Oakland Athletics | RF | 40-Man Roster – Assigned to AAA Las Vegas |
| 79 | Hunter Feduccia | Los Angeles Dodgers | C | Non-Roster Invitee – Assigned to Minor League Camp |
| 28 | Jake Fraley | Seattle Mariners | CF | 40-Man Roster |
| 34 | Kevin Gausman | San Francisco Giants | P | 40-Man Roster |
| 64 | Nick Goody | New York Yankees | P | Non-Roster Invitee |
| 36 | Will Harris | Washington Nationals | P | 40-Man Roster |
| 76 | Zack Hess | Detroit Tigers | P | Non-Roster Invitee |
| 21 | Jacoby Jones | Detroit Tigers | INF | 40-Man Roster |
| 57 | Alex Lange | Detroit Tigers | P | 40-Man Roster – Assigned to AAA Toledo |
| 26 | DJ LeMahieu | New York Yankees | 2B | 40-Man Roster |
| 27 | Aaron Nola | Philadelphia Phillies | P | 40-Man Roster |
| 26 | Austin Nola | San Diego Padres | C | 40-Man Roster |
| 74 | Michael Papierski | Houston Astros | C | Non-Roster Invitee |
| 92 | Todd Peterson | Washington Nationals | P | Non-Roster Invitee |
| 81 | Kramer Robertson | St. Louis Cardinals | SS | Non-Roster Invitee |
| 46 | Riley Smith | Arizona Diamondbacks | P | 40-Man Roster – Assigned to AAA |
| 17 | Andrew Stevenson | Washington Nationals | OF | 40-Man Roster |