The 24-year-old, who picked up a knock with Spain last week and is likely to miss United's trip to the Emirates, has been heavily linked with a switch to the Madrid giants.
De Gea joined United from Real's city rivals Atletico in 2011 for £18m.
But when asked about a move to Los Blancos he refused to rule it out but did insist he was happy at Old Trafford.
He said: “It’s not the moment to think of my future.
GETTY
David de Gea has refused to rule out a return to Spain
It’s not the moment to think of my future
David de Gea
"It’s the moment to think about Manchester as we are not in a good moment.
“I’m happy there and feel very loved by the fans. I’m focused on doing well.”
On the competition with Victor Valdes, who is training with United and linked with a move in January, De Gea insists he feels no pressure and is happy to help him recover.
He added: “Victor had a difficult injury, he had a bad time and the boss knows him well and has given him the opportunity to recover here."
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