Not sure how much cap space the Sens have to play with but here are some potential trade deadline options. They are either on expiring deals or only have a few years left under contract:
CHI: Nick Foligno (1YR), Pat Maroon, Craig Smith
NSH: Ryan O'Reilly (2YR), Michael McCarron (1YR), Luke Schenn (1YR)
ANA: Brett Leason, Jacob Trouba (1YR), Radko Gudas (1YR)
SEA: Yanni Gourde, Brandon Tanev, Jamie Oleksiak (1YR)
CGY: Blake Coleman (2YR), Anthony Mantha
BUF: Alex Tuch (1YR), Jordan Greenway
PIT: Michael Bunting (1YR)
NYI: Anders Lee (1YR)
CBJ: Boone Jenner (1YR), Mathieu Olivier, Erik Gudbranson (1YR)