They will just passby each other without knowing about each other. (that is how Kishi thinks sometimes).
Suigetsu has found info on Rinnegan. He will meet Sasuke and will tell him about it.
Sasuke will achieve Rinnegan.
Then later Itachi will again meet Sasuke. He will not try to convince him because he trusts Naruto that he will bring Sasuke back. Here, Sasuke will get angry. They will fight once again. Sasuke will win the battle showing the he has funally surpassed Itachi.