Manga it foreshadow Sasuke obtain Rinnigan long ago

[Roronoa Solos]

Sasuke's eyes are too small to be able to properly draw a sharigan in those panels so Kishi simply settled with at least making it look like something was going on in his eyes. It's nothing.

 

[Xāvî1]

it is hard to say cos the image of the eye is low qulity