Prior to this undisclosed injury, Muzzin had missed twenty games with a concussion suffered against the Montreal Canadiens back on February 21st. The worry for Leaf fans is that this latest undisclosed injury is related to the previous concussion. However, the Toronto Leafs are not providing much details relating to injuries at this point in the season, and it is unknown what this most recent injury was. Sheldon Keefe did state that Muzzin's injury was a new injury, so we can take that for what it's worth.
The 33-year-old is signed for two more seasons after this one, carrying a cap hit of $5,625,000.