Warnock believes his understanding approach has been key to Taarabt's change in fortunes and that the midfielder will eventually regret his decision to leave the club.
"My advice to him is to stay until Christmas, get some experience and show people what he can do. That may fall on deaf ears unfortunately. It's sad.
"I don't think I have ever spent so much time trying to get the best out of one individual and I think he will regret leaving."