The Portuguese joins on a temporary transfer that runs until 30 June 2018. Napoli will pay €3.75 million for the loan which, depending on the achievement of certain sporting targets, includes an obligation to buy for a further €5.5m.
Mario Rui joined Roma in the summer of 2016, and went on to make nine appearances for the club during the 2016-17 season.
His final game for the club came on 28 May 2017, in the 3-2 win over Genoa on the last day of the season.
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