According to Tuttosport, the Bianconeri have been subject to an enquiry for Marchisio with United said to have offered €15 million plus the services of want-away winger Nani.
It is thought that if an offer of sufficient value is made then the Serie A champions would be prepared to sell the Italian international, though, they do deem him important to their future plans.
However, the English side could face competition from French side Monaco who are also interested in the midfielder, who is said to be valued at around €30m by the Bianconeri.