The 26-year-old's form this season, during which he has scored 39 goals in all competitions, has reportedly attracted interest from top clubs across Europe.
Although he reiterated that he has four more years to run on his contract, he did not completely rule out a move to Spain.
"I am focused on finishing the season with my team. We do not know what can happen, but I have a contract until 2020," he told Cadena Cope.
"I've always said it would be a dream for me to play in Spain, I do not know when. I cannot say [where that will be] because I do not know how things are, but I have more family links to Madrid than Barcelona.
"And yes, I like Real Madrid a little more than Atletico."