He is rated at £12m and Mourinho told Portuguese newspaper A Bola: "We are in conversations with him and later have to sign a midfielder and an attacker."
AC Milan defender Kakha Kaladze also claims he is joining Chelsea.
However, Mourinho has said he will only sign one defender this summer and so might not want to buy both players.
Kaladze, the 27-year-old Georgian international, says he has agreed a five-year deal to move to Stamford Bridge.
Kaladze said: "Everything between Chelsea and myself has been agreed. I don't have my suitcases ready but Milan know I am not happy."
Milan sporting director Ariedo Braida said the move is "possible" but had not been agreed.