The Anzhi striker has floated the prospect of a loan return himself in recent days.
But Ranieri says: "All the teams in this league are strong and this shows in the results seen so far. Now we have to go against the current after a difficult start, and this time I will need to know to perfection the staff at my disposal.
"The return of Eto'o? Fantasy football ... I have some good players, I think only of my squad."