The only confirmed hidden stat is physicality. I don't think there's anything else, but my guess here is as good as yours.
A player with high physicality will foul and get fouled more often, so theoretically he should get injured more often, since injuries only occur on impact when a foul is committed. That's all I got.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."