Joao Santos admits United have been in contact for the Italy international.
"Jorginho is really happy in Naples. He is an indisputable starter and the team is fighting for the Scudetto," Joao Santos told RMC.
"He's a mainstay of Squadra Azzurra, so it's normal for English clubs like Manchester United to ask about him.
"But I want to make it clear that there is nothing official right now."