The former Sambenedettese coach, who turns 44 on January 6, embarks on his second spell in charge with his new side rock bottom of the Serie A table, five points from safety.
A statement on the club´s official website read: "Cagliari Calcio announces that Davide Ballardini is the new first team coach. He replaces Nedo Sonetti to whom we give our thanks for his hard work and utmost professionalism."
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