The deal is subject to a medical.
Right-back Pamarot, 25, joined Nice in 1998 and has been selected for French national squads without earning his first cap.
He actually made a couple of appearances for Portsmouth on loan back in the 1999-2000 season.
Our Sporting Director Frank Arnesen said: "Noe is physically strong, quick and a good defender. He is also tough but comfortable on the ball. He is a good addition to the squad and after the loss of Stephen Carr, a player we needed."
We have agreed a deal to bring defender Noe Pamarot to the club from French First Division outfit Nice.