The Manchester United centre backs future has been the subject of intense speculation for some time and Real have been heavily linked with a summer swoop.
Silvano Martino accepts that he cannot rule out a move, but says he is in the dark over any possible interest from Real.
The 28-year-old, who is currently resting after the World Cup, is focused on playing for United and will return to training with the Red Devils next week.
"Real Madrid? So far the Spanish club has not contacted us," Martino told Itasportpress.it.
"It is difficult for him to leave England even if with the market open anything can happen."