Unfortunately, after playing 26:23 in Game 4, Auston Matthews was not on the ice on Monday for the Leafs, which has fans feeling uneasy. The team has already confirmed that Matthews' absence is rest-related, but his ongoing health issues this season do leave room for some concern.
Despite having played through the issue for much of the season and the playoffs, Matthews has still managed to he quite productive, producing 1 goal and 5 points across 4 games this post-season. He has also played exceedingly well on the defensive side of the puck.
At this point, Matthews' absence from practice is not expected to prevent him from suiting up for Game 5, but if he continues to take additional rest on practice days throughout the course of the playoff run, it won't do much to dissuade anyone from being concerned.