He told Radio Crc (h/t Goal's Chris Burton):
"As a player for one of the most important national teams, and a club fighting for the Scudetto, it's clear he'll be looked at by these clubs. I've spoken with [Napoli sporting director Cristiano] Giuntoli three times in recent months, he hasn't told me anything, but I haven't had any contact with United.
"He [Jorginho] has two years on his contract and negotiations [for a renewal] will begin for that reason, because it becomes dangerous and then expires. We're not thinking about it right now, but we will do later."
Jorginho has become a key figure for Napoli since arriving at the club in 2014 from Verona and has been a virtual ever-present for Maurizio Sarri's side as they challenge for the Serie A title.
The Partenopei are in second place in the Serie A table and just two points behind leaders Juventus with nine games left to play.
WhoScored.com showed how Jorginho has impressed in Italy's top flight:
Most passes per game in Serie A this season: 1⃣ Jorginho - 95.3 2⃣ K. Koulibaly - 84.1 3⃣ R. Albiol - 82.7 4⃣ M. Hamsik - 79.4 5⃣ F. Ghoulam - 75.4 Best pass success rate in Serie A this season: 1⃣ Napoli - 88.0% Dominant on the ball -- https://t.co/x7C9pJR0Py https://t.co/WBW4pMsqw7
United manager Jose Mourinho may look to reinforce his midfield in the summer with Michael Carrick having announced he will retire, as noted by BBC Sport:
Santos has also said there is interest in Jorginho from Premier League clubs, per Radio Marte (h/t Football Italia).
United are in need of a quality replacement for Carrick and Jorginho is an option, according to football writer Liam Canning:
Jorginho's future is likely to remain the subject of speculation while the midfielder continues to shine in Serie A and with Napoli yet to renew his contract.
The midfielder's current deal runs until 2021, and Santos has said he will wait until May to discuss a new deal with Napoli, per The Sun (h/t Football Italia).