Is it a known bug ?
I would have appreciate a clarification on what to understand from the confusing messages then. Never mind.
Anyway, for the record, it's a common bug when a player gets injured from what I have seen.
On Sun 14th, the icon showed a one week injury.
My player was back on the training ground last sunday so it makes up to a 8-day injury.
Unfortunately, he played tonight and picked up an injury again. I feel released to vent my deep frustation ;)