The latest addition to that list is forward Milan Michalek, who had arthroscopic surgery on his right knee Tuesday and is out indefinitely. Michalek has played just two games since originally getting hurt during pre-game warmups prior to a game against the Pittsburgh Penguins on Feb. 13.
Senators general manager Bryan Murray knows replacing Michalek with a player of similar skill won't be easy.
"I don't know how you ever get a scorer in the NHL anymore, but if you can get a top-six forward it's always the objective," Murray told the Ottawa Sun. "I haven't identified anybody who is going to be moved."