Blues coach Ken Hitchcock disclosed his decision Monday.
Halak was injured in the second game of the Blues' first-round series against San Jose, leaving with an undisclosed lower-body injury that is believed to be a sprained left ankle he suffered during a collision with teammate Barret Jackman.
St. Louis had the deepest goalie tandem in the NHL this season. Brian Elliott led the NHL with a 1.56 goals-against average, including nine shutouts.
The NHL has not yet announced specific dates for the Blues-Kings series.
When somebody goes out and is there to score goals, but is also there to make some big hits, fight, do all of those things, and he has a great mustache, it was great to see him get that hit and get everybody going.
— Colin Wilson on teammate Eric Nystrom, who scored a goal in Predators' win vs. Kings