Transactions
| Date | Player | Pos | Transactions |
| 11/24 | Dan Renouf | D | Called up from minors from Grand Rapids-AHL |
| 11/24 | Danny DeKeyser | D | Placed on IR COVID-19 protocol |
| 11/15 | Joe Veleno | C | Called up from minors from Grand Rapids-AHL |
| 11/13 | Mitchell Stephens | C | Placed on IR Lower-body injury - left game |
| 11/9 | Troy Stecher | D | Placed on IR Wrist |
| 11/7 | Joe Veleno | C | Sent to minors Grand Rapids-AHL |
| 10/30 | Joe Veleno | C | Called up from minors from Grand Rapids-AHL |
| 10/26 | Kyle Criscuolo | C | Sent to minors Grand Rapids-AHL |
| 10/26 | Gustav Lindstrom | D | Placed on IR Lower-body injury |
| 10/25 | Kyle Criscuolo | C | Waived |
| 10/17 | Dylan Larkin | C | Suspension Over |
| 10/15 | Dylan Larkin | C | Suspended One game by NHL for roughing |
| 10/11 | Patrick Curry | C | Released |
| 10/11 | Bobby Ryan | RW | Released |
| 10/11 | Taro Hirose | LW | Sent to minors Grand Rapids-AHL |
| 10/11 | Riley Barber | RW | Sent to minors Grand Rapids-AHL |
| 10/11 | Joe Veleno | C | Sent to minors Grand Rapids-AHL |
| 10/11 | Kyle Criscuolo | C | Placed on IR Undisclosed injury |
| 10/11 | Seth Barton | D | Placed on IR Undisclosed injury |
| 10/10 | Calvin Pickard | G | Sent to minors Grand Rapids-AHL |
| 10/10 | Taro Hirose | LW | Waived |
| 10/10 | Riley Barber | RW | Waived |
| 10/9 | Luke Witkowski | RW | Sent to minors Grand Rapids-AHL |
| 10/9 | Dan Renouf | D | Sent to minors Grand Rapids-AHL |
| 10/9 | Jonatan Berggren | RW | Sent to minors Grand Rapids-AHL |
| 10/9 | Calvin Pickard | G | Waived |
| 10/8 | Adam Brubacher | D | Released |
| 10/8 | Brian Lashoff | D | Sent to minors Grand Rapids-AHL |
| 10/8 | Chase Pearson | C | Sent to minors Grand Rapids-AHL |
| 10/8 | Ryan Murphy | D | Sent to minors Grand Rapids-AHL |
| 10/8 | Luke Witkowski | RW | Waived |
| 10/8 | Dan Renouf | D | Waived |
| 10/7 | Jon Martin | RW | Released |
| 10/7 | Dennis Yan | LW | Released |
| 10/7 | Hayden Verbeek | C | Released |
| 10/7 | Kirill Tyutyayev | LW | Released |
| 10/7 | Tyler Spezia | LW | Released |
| 10/7 | Dominik Shine | RW | Released |
| 10/7 | Turner Elson | LW | Released |
| 10/7 | Kaden Fulcher | G | Sent to minors Toledo-ECHL |
| 10/7 | Victor Brattstrom | G | Sent to minors Grand Rapids-AHL |
| 10/7 | Donovan Sebrango | D | Sent to minors Grand Rapids-AHL |
| 10/7 | Wyatt Newpower | D | Sent to minors Grand Rapids-AHL |
| 10/7 | Jared McIsaac | D | Sent to minors Grand Rapids-AHL |
| 10/7 | Brian Lashoff | D | Waived |
| 10/7 | Ryan Murphy | D | Waived |
| 10/6 | Alex Cotton | D | Assigned to Junior Club Lethbridge-WHL |
| 10/6 | Mason Ward | D | Released |
| 10/6 | T-Bone Codd | RW | Released |
| 9/25 | Oscar Plandowski | D | Assigned to Junior Club Charlottetown-QMJHL |
| 9/25 | Cross Hanas | LW | Assigned to Junior Club Portland-WHL |
| 9/25 | Sebastian Cossa | G | Assigned to Junior Club Edmonton-WHL |
| 9/25 | Jan Bednar | G | Assigned to Junior Club Acadie-Bathurst-QMJHL |
| 9/25 | Pasquale Zito | LW | Assigned to Junior Club Windsor-OHL |
| 9/25 | Cooper Walker | C | Released |
| 9/25 | Cameron Butler | RW | Released |
| 9/25 | Luke Toporowski | LW | Released |
| 9/25 | Jakub Vrana | LW | Placed on IR Shoulder |
| 9/21 | Patrick Curry | C | Invited to Training Camp |
| 9/21 | Tyler Spezia | LW | Invited to Training Camp |
| 9/21 | Mason Ward | D | Invited to Training Camp |
| 9/21 | Dennis Yan | LW | Invited to Training Camp |
| 9/21 | Luke Toporowski | LW | Invited to Training Camp |
| 9/21 | Jon Martin | RW | Invited to Training Camp |
| 9/21 | Cooper Walker | C | Invited to Training Camp |
| 9/21 | T-Bone Codd | RW | Invited to Training Camp |
| 9/21 | Cameron Butler | RW | Invited to Training Camp |
| 9/21 | Turner Elson | LW | Invited to Training Camp |
| 9/21 | Hayden Verbeek | C | Invited to Training Camp |
| 9/21 | Dominik Shine | RW | Invited to Training Camp |
| 9/21 | Adam Brubacher | D | Invited to Training Camp |
| 9/21 | Bobby Ryan | RW | Invited to Training Camp |
| 9/14 | Givani Smith | LW | Re-Signed Two-year contract |
| 9/7 | Eemil Viro | D | Assigned to European Team TPS Turku-Finland |
| 9/3 | Filip Hronek | D | Re-Signed Three-year contract |
| 9/2 | Carter Rowney | RW | Signed as Free Agent One-year contract |
| 8/19 | Frans Nielsen | C | Waived For purpose of contract buyout |
| 8/15 | Adam Erne | RW | Re-Signed Two-year contract |
| 8/14 | Sebastian Cossa | G | Signed Three-year, entry-level contract |
| 8/10 | Jakub Vrana | LW | Re-Signed Three-year contract |
| 8/5 | Chase Pearson | C | Re-Signed One-year contract |
| 7/31 | Tyler Bertuzzi | LW | Re-Signed Two-year contract |
| 7/30 | Brian Lashoff | D | Signed as Free Agent One-year contract |
| 7/30 | Mitchell Stephens | C | Traded for '22 6th-rd pick |
| 7/29 | Dan Renouf | D | Signed as Free Agent One-year contract |
| 7/29 | Luke Witkowski | RW | Signed as Free Agent Two-year contract |
| 7/28 | Turner Elson | LW | Became Unrestricted Free Agent |
| 7/28 | Hayden Verbeek | C | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/28 | Dominic Turgeon | C | Became Unrestricted Free Agent |
| 7/28 | Joe Hicketts | D | Became Unrestricted Free Agent |
| 7/28 | Valtteri Filppula | C | Became Unrestricted Free Agent |
| 7/28 | Sam Gagner | RW | Became Unrestricted Free Agent |
| 7/28 | Mathias Brome | LW | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/28 | Luke Glendening | C | Became Unrestricted Free Agent |
| 7/28 | Darren Helm | LW | Became Unrestricted Free Agent |
| 7/28 | Dylan McIlrath | D | Became Unrestricted Free Agent |
| 7/28 | Calvin Pickard | G | Became Unrestricted Free Agent |
| 7/28 | Alex Biega | D | Became Unrestricted Free Agent |
| 7/28 | Bobby Ryan | RW | Became Unrestricted Free Agent |
| 7/28 | Patrik Rybar | G | Became Unrestricted Free Agent |
| 7/28 | Henrik Zetterberg | C | Became Unrestricted Free Agent |
| 7/28 | Christian Djoos | D | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/28 | Evgeny Svechnikov | RW | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/28 | Kevin Boyle | G | Became Unrestricted Free Agent |
| 7/28 | Jordan Oesterle | D | Signed as Free Agent Two-year contract |
| 7/28 | Pius Suter | C | Signed as Free Agent Two-year contract |
| 7/28 | Ryan Murphy | D | Signed as Free Agent One-year, two-way contract |
| 7/28 | Sam Gagner | RW | Signed as Free Agent One-year contract |
| 7/28 | Calvin Pickard | G | Signed as Free Agent One-year contract |
| 7/27 | Kyle Criscuolo | C | Contract extended Two-year, two-way contract extension |
| 7/27 | Taro Hirose | LW | Contract extended One-year, two-way contract extension |
| 7/26 | Gustav Lindstrom | D | Contract extended Two-year, two-way contract extension |
| 7/25 | Marc Staal | D | Contract extended One-year contract extension |
| 7/22 | Michael Rasmussen | RW | Contract extended Three-year contract extension |
| 7/22 | Alex Nedeljkovic | G | Contract extended Two-year contract extension |
| 7/22 | Alex Nedeljkovic | G | Traded for Jonathan Bernier, '21 3rd-rd pick |
| 7/16 | Nick Leddy | D | Traded for Richard Panik and '21 2nd-rd pick |
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