When reanimated Itachi fought against Naruto, he asked him what happened to Sasuke. Naruto proceeded to tell him about what Obito (at the time, Madara) said, and tells him the convince Sasuke to join the Akatsuki while taking revenge on Konoha for betraying his brother.
Itachi then looks surprised and says "Damn Madara, he knew about my secret mission after all".
However, given the fact that Itachi asked for his help in massacring the Uchiha, why is he so surprised? After all, he told him enough about it.