Claudius mate it’s also on them. If you are Cala and injury prone use your fucking head and not go for dangerous flying tackles.
If you are Jesus and already semi -injured in a game don’t go for lunging tackles in a fucking 3rd round of the FA cup. Use your common sense.
Players can have a massive influence on their fitness by as I said choices, behaviours, how they train, listening to their body, not doing moronic things on the pitch.
Look at Partey, has stayed fit all year because he wanted to.
I understand freak injuries like Diaby but players are also responsible for their own health and fitness.