I've been thinking that we could have somehow two kinds of injuryes, those who are caused by the aggressive tackling so are unexpected, but, when a player for some reason isn't in his best day, and have a high % to be injured, we could have a visual signal like a excess of condition loss.
So then we could detect somehow that a player isn't fine and then manage the team properly preventing a posible injury based on something tangible.
Because in reality many times a coach can see when something isn't right, a player can't run properly or just don't feels good and this would create the effect.