Forlan has missed the season so far with injury.
Ranieri said: "I will take Milito to Genoa and only tomorrow will decide whether or not to field him. Forlan will be on the bench - he is an immense player, beautiful, classy, good temperament and is surely good for Inter.
"He is eager, you must hold him in chains because he always wants to play, he is like [Wesley] Sneijder - always says he is ok. It is up to us to know how to manage him. Forlan is a modern player, he knows more than one role to play and thinks about teamwork and this is very important."