Matthews was originally believed to be dealing with some sort of an illness, most commonly reported as food poisoning, but when the days continued to pass with Matthews not getting any better, it led to plenty of speculation, including comments from the NHL's premier insider, Elliotte Friedman, that Matthews might actually be dealing with an injury rather than an illness.
Tonight's Game 6 is do-or-die for the Leafs, just like Game 5. However, their track record at home has been abysmal in the playoffs over the last couple of seasons. The hope is that Matthews will be good to go tonight and that the Leafs can force a final and deciding Game 7 back in Boston.
The earliest report from TSN's Chris Johnston is that Matthews is not on the ice for practice and that it doesn't bode well for his status for Game 6. Of course, we'll have to wait to hear from Sheldon Keefe before we make any assumptions. After all, he did look to be moving pretty well.