I think he is gone once Sarri comes,
although he played Giroud in cups so Mandu may stay, but im not sure
But he is bringing back Higuain, so if we play 4-3-3 he is probably gone, we still have Kean, Gonzalo, CR7?and maybe Dybala for the Central striker spot?
if he wants to throw back to the empoli time he might try a 4-3-1-2, Mandzu might stay, but i dont see Sarri playing anything other than 4-3-3