Toronto Maple Leafs star Auston Matthews is "unlikely to be available" for Game 5 against the Boston Bruins on Tuesday night, according to The Athletic's Jonas Siegel and Chris Johnston.
Matthews is "battling an illness," and also "believed to be nursing an undisclosed injury," Siegel and Johnston reported.
The Leafs face a 3-1 first-round series deficit and need a win in Boston to extend their postseason.
Matthews missed the third period of the Leafs' Saturday night after skating just over 14 minutes in the Game 4 loss.
He participated in Toronto's optional Tuesday morning skate in Boston, per David Alter of The Hockey News.