The Chile international is the subject of interest from several big clubs, including Chelsea, says TMW.
His agent, Claudio Vagheggi, said: "Isla is a player who has many enquiries, we have several appointments. My role as an agent is to listen to various enquiries and then bring them to the club.
"Not only is there Inter Milan and Paris Saint Germain but also other important foreign teams.
"He has a contract until 2016 and we will bring the offers to the club."