If you are referring to the Danzo fight, then Sasuke didn't do that he used a MS genjutsu. Another thing I keep saying is that whenever Tsukuyomi is used it is said so, but when Sasuke uses his MS genjutsu it isn't stated as Tsukuyomi why is that? The author has had numerous opportunities to state that Sasuke has it, but hasn't why, simply because he doesn't have it.
Secondly, each MS technique is named after a Shinto God, so what sense does it make to give Sasuke four ( Amaterasu, Kagutsuchi, Susano'o and Tsukuyomi) and Itachi three ( Tsukuyomi, Amaterasu, and Susano'o) ?