The two players have undergone their Azzurri medicals and all that is missing are their signatures on contracts.
"It is not official yet, but they are players of a certain experience," Mazzarri said.
"Gamberini is a player who, like Goran Pandev, needs to be re-evaluated. He has some important experience and is an Italian international.
"Behrami is younger, a player who has always done well and has never thrown in the towel. He, like Gamberini, can cover a number of roles.
"He can play in the middle of midfield and on the wing. He is a player who can be very useful."