I think in many other sports games I played, like some basketball games, if a player in team was injured, before he got fully recovered, his attributes would be reduced.

I feel the design of injuries in FTG is interesting, which is, the injured footballer won't get his attributes reduced, but "just" cannot play any match while injured, or, it might mean the footballer also cannot participate in any training. So, for example, if the footballer misses 4 months of matches and trainings, his attributes would "increase zero" in those 4 months, which is like "his attributes get reduced in a different way".

And also, during his injury recovery, his skills development would be paused, too.