Yer lets clarify before we find out our player that we just spent millions of dollars on, is a clutz and keeps brandishing weapons in the locker room and getting arrested.
So, no one is suggesting out of game injuries. The only possibility on this, would be injuries based around training, but, as LA-Kukoc said, way way way too complex, so lets leave that out.
The original suggestion is that - injuries can occur, in game, at the current frequency, but by means other than flagrant fouls.