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, $$$)
BRA: Amaral, Pato(could have done much better, I was expecting more but he was 2-3 years younger than others), Jo, Renato Augusto, Luizao.
CHI: Sanchez, Grondona.
CZE: Kalouda, Strestik, Suchy.
MEX: Too famous and $$$ for Juve..Vela, Dos Santos...
POL: Janczyk
POR: Antunes, Coentrao(bought by Benfica...fast, great dribbler), Gama.
ESP: Barragan, Valiente, Piqué(ManU), Capel, Mata(was ok, expected more).
URU: Cavani...too late also...plays with Palermo...Caceres.
USA: Adu.