| 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. |
| Cory Conacher was added to Senators. |
| Brad Hunt was added to Senators. |
| Nikita Zadorov was added to Senators. |
| Ryan Murphy was added to Senators. |
| Michael Ryder was released. |
| Runners didn\'t make playoff for year 2017. |
| Senators paid 0 € to release Karri Ramo. |
| Kyle Pettit was added to Senators. |
| Tyler Vesel was added to Senators. |
| Senators paid 0 € to release Marc Cheverie. |
| TRADE : From Bruins to Senators : Brad Hunt. |
| TRADE : From Senators to Sabres : Nikolay Goldobin. |
| Matt Duchene was added to Senators. |
