Logically I agree it should take its toll and it probably does over the long term. It is just that there are so many instances of teams with minimal rotation not having huge injury lists that I'm not convinved how strong the link is between regular games and injury vulnerability and how much is just down to the individual.It's not th only reason I admit. But I do think it's a factor.
Fabregas barely played for Barca last year, McCarthy played just about every game when he joined. (Because he's boss like).
It's bound to take its toll.
Tbh I'm not sure about many things these days - apart from McCarthy being boss