That said, it might be worth it. We will have to pay somewhere around 10m€ next summer if he has a great season. But if we had only loan him, he would prob not be playing as much as he will now as a co-owner.
We need quality and by selling half of a talentet youngstar we can buy what we really need. 4m is a fine deal IMO. We can't really know how good Immobile will do in serie a. Genoa is a good club for him..