The Lightning will be without goaltender Andrei Vasilevskiy for four to six weeks because of a fractured left foot.
The team got that assessment Friday after Vasilevskiy, hurt during Wednesday's practice in Pittsburgh, was evaluated by its doctors in Tampa.
This means the Lightning will be without one of its best and most important players for at least 14 games on the four-week end of the estimate.
The team had no further comment.
Louis Domingue will start for Vasilevskiy, who entered Friday tied for second in the league in wins with nine. Vasilevskiy, a Vezina Trophy finalist last season, is 9-3-1 this season with a save percentage of .