As Nikolai Ozolin layed out in 1971; flexibility day-to-day, strength week-to-week, speed month-to-month, and endurance year-to-year... I believe our biggest issue is keeping athletes moving. The injuries aren't going to be prevented from some special program or wondrous prehab exercises, it's simply a matter of more consistent movement. Athletes may train hard 1-2 hours a day, for 4-5 days a week, but the free time is filled with a whole lot of nothing as far as physical movement goes. Weekends, especially, can 'ruin' athletes.
If flexibility is day-to-day, which I can assure you it is, then it's the 1-2 days 'off' that's a major problem. I am not talking structured workouts per se, but I am saying movement; full range-of-motion, varied total body movement... everyday. Time spent 'in' the body, is time well spent; get to know the body by using it often. (... as I write in Cartesian dualism... which is probably our problem right there)
Rehabilitation "training" is usually not the answer, it's simply a reaction, and one that doesn't do much justice except for making some folks money. Rehabilitation absolutely has its place but lets keep it there; the root of the problem is lack of movement in general, and usually that's free.
Prehab - A flawed concept.
Coach Vern Gambetta hits a nail on the head with this one.