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.
It is really special. I had a lot of friends and family here tonight, and for my first [NHL] game in here it was great. I played here as an elementary-school player in the city championships and this was my first time back. It was a lot of fun..
— Toronto native Brandon Pirri after scoring 2 goals for Panthers in win at Maple Leafs on Thursday