Celtic have confirmed the signing of the 26-year-old striker.
"Celtic is a huge club with a magnificent history and a fantastic support," Nouioui said.
"I know all about the wonderful atmosphere at Celtic Park and I can't wait to play there.
"I know that Celtic already has a great squad of players and I'm very much looking forward to joining up with my team-mates.
"I hope to play my part in bringing success to the club."