This is the one reason that i don't train them.
I just play friendly matches with the second and weaker lineup. So that means that i never force my first squad and if someone in my first squad gets an injury from league cl or cup than i will only use the boosters. That's why i have 330 and stable first squad
The train was on the subs, and i have more that 400 reds and greens, so i am not to worry, but i just think that 9 injurys in 3 days it is just to mutch.