Ive also heard this, but cant find anything remotely solid on it at all.
Anyway.
Drenthe, a very, very talented boy, pacey as fck, skillful as fck and packs on awesome shot, but totally and utterly mental.
If you can keep his head in the the game and keep him away from distractions off the pitch, hes a player.
But hes trouble with a capital T.