Ariaudo was desperately looking for some first team action when the Rossoblu approached him.
"I have to thank President Massimo Cellino who gave me the opportunity to join Cagliari," said Ariaudo. "I am happy because I moved to a prestigious club which I have always followed with respect.
"Of course I am also grateful to Juve, because you can't forget 12 years of memories like that. But my new teammates have welcomed me very well and there is a good feeling with the Coach too."
Ariaudo will be wearing the No. 3 shirt and was told by his former teammates Antonio Chimenti positive things about the Sardinians.
"It is the number I used at Juventus and with the Nazionale and I hope it will be a lucky one for me here.
"Chimenti told me of the great enthusiasm here and I have to say he was right. I am a central defender but can play as a full-back too.