Deco made 30 appearances for Chelsea after his move from Spain
Midfielder Deco has admitted he is unhappy at Chelsea and wants to be reunited with his former Porto manager Jose Mourinho at Inter Milan.
He arrived for £8m from Barcelona last summer but fell out of favour after boss Phil Scolari left and was replaced by temporary coach Guus Hiddink.
“I want to feel happy and this is not the case at Chelsea,” he said.
“I would like to return to work with Mourinho, he is synonymous with success and I would be very happy.”
The Portuguese international did not cross paths at Stamford Bridge with Mourinho but he spent two of his four seasons at Porto playing under him.