Did you see some of the comments under the Italian stories? Fans saying exactly that. "He's no Baggio, he's no Nesta" etc. Because of his age and recent injury they consider him a marginal to even make the team.
Napoli are offering him half what he makes because Chucky Lozano has taken his spot and is performing for a fraction of the money. He just had an eleven-goal season and cost them more than $40M, so he's going to be starting there anyway. They lose nothing out of this but shedding some salary, basically.