SPAL have officially sold 24-year-old left-back Filippo Costa to Napoli, announced the club.
Costa came up through the Chievo youth academy, with spells on loan at Pisa and Bournemouth.
He joined SPAL on loan with option to buy in January 2017 for six months.
Last season, Costa made 11 appearances for SPAL between Serie A and the Coppa Italia.
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