The Napoli wing back says that the temptation of moving to one of the Liga giants remains strong despite recently agreeing to a new long-term contract in Italy.
The Colombian rejected long-standing interest from Juventus by agreeing a new contract with the Partenopei to run until 2019, and declared the club to be his "home."
However, speaking to Corriere dello Sport, the former Siena defender acknowledged that he would not rule out a move to La Liga if one of its two biggest clubs came calling.
"I have renewed my contract with Napoli and would not say too much right now on rumors that do not exist," the 27-year-old said. "However, the stories are persistent and I know that in football a transfer is always around the corner. It could happen or not, but it is impossible to think of predicting the future. And honestly I'd also add Barcelona and Real Madrid are a dream for any footballer."
Zuniga, who has made more than 150 appearances for the San Paolo outfit, insists he is happy with the progress shown under Rafa Benitez this season and maintains his side has a strong chance of lifting the Serie A trophy despite a 3-0 loss to Juventus.
"We have made considerable progress with the arrival of Benitez," he continued. "We acquired an international dimension with the acquisitions of [Pepe] Reina, [Gonzalo] Higuain, [Raul] Albiol and [Jose] Callejon. We have a team who know what it means to win in La Liga, the World Cup, European Championship and how to manage the stress of being highly ranked.
"It will be tough to beat us, even if it's funny to say now that we are back from a defeat."
Napoli, which sits third in Serie A, resumes its league campaign against Parma on Saturday.