The pitch/grass condition has a slight effect to a possible injury.
Important is the condition of the players, training and participation in two games/day.
I have a team which played this season at lv1, with the 1st grass quality and had very few injuries because I didn't have a 2nd game in a day and my players were old (so didn't train them at all).
Sometimes if you 're playing with a team with low q players , or playing out of position, they tend to "kill" your players
Another reason is bad luck![]()