Uvini is eager to move to Italy, having also interested AS Roma.
"The operation has not been concluded yet," agent Stefano Castagna told Radio Marte.
"Uvini is a young lad and Napoli are tracking him, but he's not an Azzurro player yet. It will take more time and there are two weeks until the end of the transfer market.
"We have a good rapport with Napoli and he is one of the five or six Brazilian defenders they are looking at.
"Naturally, Napoli would be a very welcome destination and we hope it goes through. They represent the best prospect for us.
"Uvini is a born leader and Thiago Silva compared him to Lucio. He was on loan at Tottenham, but they did not make the move permanent because everything there has changed in the last three months."