| Alex Lyon was added to Senators. |
| Richard Panik was added to Senators. |
| Ashton Sautner was added to Senators. |
| Patrik Elias was added to Senators. |
| TRADE : From Senators to Devils : Troy Brouwer. |
| Luca Sbisa was added to Senators. |
| Jiri Tlusty was added to Senators. |
| Kerby Rychel was added to Senators. |
| Jason LaBarbera was released. |
| TRADE : From Senators to Golden Knights : Luca Sbisa. |
| Gabriel Carlsson was added to Senators. |
| Darroll Powe was released. |
| Senators paid 0 € to release Dan Dunn. |
| Ben Youds was released. |
| Mikko Vainonen was added to Senators. |
| Erik Brannstrom was added to Senators. |
| Senators paid 412.912 € to release Ronalds Kenins. |
| Mark Streit has been selected as captain for Senators. |
| Jason LaBarbera was added to Senators. |
| Ramon Untersander was released. |
