Chelsea full-back Filipe Luis says he is in the dark over his future at Stamford Bridge.
Luis, 29, was brought to West London last summer from Atletico Madrid but has been unable to displace Cesar Azpilicueta as Jose Mourinho's first choice at left-back.
Having made just 15 Premier League appearances during the 2014-15 season, the Brazil international has been linked with a return to the Vicente Calderon, where manager Diego Simeone is ready to welcome him back with open arms.
Marca said Real Madrid have also made an approach for the defender, only for Luis to quickly dismiss the idea of joining his former club's city rivals.
Speaking after Brazil's 1-0 victory over Honduras, Filipe Luis said: "I do not really know what will happen. I have a contract with Chelsea and I belong to the club, so it is up to them."
Luis won La Liga in his final season in Spain and the club have struggled to fill the void he left. Guilherme Siqueira was brought in from Granada while Cristian Ansaldi arrived on loan to provide cover, but neither have proved to be an able replacement. As a result Jesus Gamez, a right-back by trade, has often filled the left-back slot this season.
Atletico have made no secret of their desire to bring Filipe Luis back to the Spanish capital, with manager Simeone recently declaring: "He is a player who we love as a person. He also knows us well and has given a lot to the team. I hope [his return] goes through."
Filipe Luis, along with compatriot Willian and Colombia international Juan Cuadrado, are all involved in this summer's Copa America, which kicked off on 11 June. The competition runs until 4 July and with Brazil expected to reach its final stages, Mourinho has already confirmed his South American stars will be given an extended rest when they return from international duty.