The Spaniard could be out of contract in the summer, as he has not agreed an extension with Real.
Despite reports linking United to Ramos, they may not have made him an offer yet.
According to respected transfer expert Fabrizio Romano, United have not contacted Ramos or his agent.
There is no link between the two parties right now, but that could change if Ramos firmly decides to leave Real.
PSG have also been linked with the World Cup winning defender.