Juan Jesus has officially signed a one-year contract for Napoli, with an option to extend for another season.
The defender was a free agent after his deal with Roma expired on June 30.
He reunites with former Giallorossi coach Luciano Spalletti at the Stadio Diego Armando Maradona.
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The 30-year-old centre-back can also play as a left-back when needed.
His previous clubs include Internacional and Inter, while he has four senior caps for Brazil and won the Under-20 World Cup in 2011.