What is happening?

Just when everything was looking better for the Toronto Maple Leafs, they get hit with some more bad news. 

Mitch Marner hit the ice for practice with his teammates this morning and everything looked on the up and up. 

However after only 10 minutes Marner left practice and didn't return. 

Now head coach Sheldon Keefe has labelled him a "game time decision" which isn't the best news. 

More details to come as the day goes on.