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The Atalanta defender will stay with his current club on loan until 2018 before linking up with the Bianconeri on a contract running until 2021

Juventus have signed Atalanta defender Mattia Caldara in a deal that could be worth as much as €21 million.

The Bianconeri will pay €15m in four instalments for the 22-year-old, with an extra €6m in bonuses dependent on certain conditions being met during his time in Turin.

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Caldara will be loaned back to Atalanta for 18 months before beginning his Juve career in the summer of 2018. He has penned a deal until 2021 with the reigning Italian champions.

An Italy Under-21 international, Caldara has impressed as part of a young Atalanta side that has risen to sixth in Serie A this season under Gian Piero Gasperini.

On Wednesday, his team-mate Roberto Gagliardini joined Inter in a €25m deal and midfielder Franck Kessie has been the subject of regular transfer speculation.

Caldara, a centre-back, has scored three goals in 11 games in Serie A this season. Known for his intelligence and serenity, he has been compared to Juve veteran Andrea Barzagli.

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Atalanta have not finished in the top half of the Serie A table since their most recent return to the top flight for the 2011-12 season.

Caldara is Juventus' second first-team signing of the month following the arrival of Genoa midfielder Tomas Rincon for €8 million.

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