There was a Nigerian that impressed me at the U-20 WC, he reminded me of Essien.
He plays for Anderlecht and his name is Olufemi.
Other notables:
ARG: Fazio, Escudero(didn't play but I heard he's good), Banega, Zarate, Aguëro(already with ATL-MAD, $$$)
BRA: Amaral, Pato(could have done much...