I can't find the article now but read an update on him returning a week or two ago and they had a term for Ferland's issue but I cannot think of it. Basically the concussions caused and inner ear issue so his last injury or "concussion" wasn't actually a concussion but a recurrence of the inner ear issue. Dizziness, loss of balance etc.
They referenced a retired player that came out about the same issue and he still deals with it to this day. I loved Ferland, love everything about his game so I really hope he can get past the medical concerns and a long career. Or calls it a career before things get life altering.
Here it is.
https://www.sportsnet.ca/hockey/nhl/...scare-day-day/