However, his performance has declined since then. Worries began when he missed practice before Game 3, and escalated when team doctors pulled him from Game 4 at the end of the second period, and he didn't return for the third.
Matthews sat out Game 5 and has now been ruled out for Game 6. Chris Johnston, from TSN and The Athletic, has confirmed the worst fears - it's more than just an illness.
We may not know the full extent of his condition until the Leafs are out of the playoffs, but the small bright spot is that Matthews skated for 30 minutes this morning, indicating some progress.
