The Italian is rated as one of the most impressive defenders in Europe at present.
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Per Corriere dello Sport, Buongiorno is also wanted by Serie A giants Napoli.
They have reportedly offered €35 million, but Torino are seeking a fee in the region of €45 million.
Whether Newcastle can reach such a sum is unclear, given their issues with Premier League financial regulations.
However, Buongiorno does share an agent with Sandro Tonali, who moved to Newcastle a year ago.