Napoli have completed the signing of Roma defender Mario Rui.

The 26-year-old joined Roma from Empoli last summer on a similar arrangement but made just nine appearances for the Giallorossi in 2016-17, having damaged knee ligaments in the first part of the campaign.

He is reunited with Coach Maurizio Sarri, whom he worked under in Tuscany between 2013 and 2015.

A statement on Roma's official website read: “The Portuguese joins on a temporary transfer that runs until 30 June 2018.

“Napoli will pay €3.75m for the loan which, depending on the achievement of certain sporting targets, includes an obligation to buy for a further €5.5m."