What could he do? Play himself? I doubt Ederson would shit himself.
He can't do a shit being ex-dipper manager. He can prepare the game as best as he knows, just as he is definitely doing it before any other game. This ex-manager thing is vastly overrated, specially when they play the team that competes against their former club. Players don't give a fuck about his eventual fandom and will play as they play. Rafa for ex. could put strange team against Liverpool and help them that way, but doubt he'd do that too.