He appears all set for an imminent move, with Real Madrid, Barcelona, and some top Premier League clubs all linked with the forward.
Warnock said: "He didn't always feel like he had to work as hard as anyone else because he has such natural fantastic ability.
"Victor has put the horrible, nasty bit into his game now and takes kicks. He has two, three players marking him now.
"He's tackling, chasing back, taking gambles on flick-ons. He has been a complete player for the last two months."