There are some decent(ish?) FAs still available - Labanc, Okposo, Hoffman, Pacioretty. Not sure any of them want to come here to play, at most, 3rd line minutes in what will likely be a lost season.
Absent lines, I'd imagine the following guys would be in the top 9: Monahan, Jenner, Fantilli, Marchenko, Voronkov, Sillinger, Johnson, Chinakhov. That, to me, leaves one top 9 spot - maybe a Dumais or Brindley surprises or a FA, or Danforth in a pinch with Malatesta on the 4th line with Kuraly and Olivier.