One day = One player injured ?

[FakeFC]

Hey, I started top eleven few days ago, and since the beggining of the new season, I built infirmary level 2, and field level 2. Although I have this 2 improvments, each match, one of my players gets injured.

Today, my best played had 13 days out (broken leg), yesterday, my new player bought 10min before the match took 5 days out, the day before, my keeper 10 days, etc etc etc...

My players are always > 80% condition & moral and are rather young (19-25)

If it continues, next will I won't have 11 players to play... It won't be Top 11 but Top 8 or 9 lol

Just... WHY ?