The Brazil-born former Portugal playmaker looks set to be released from his Blues contract, with Rio de Janeiro-based Fluminense reportedly a possible destination. He told Brazilian newspaper Lance: "It's been 13 years since I left Brazil for playing in Europe.
"Now I want to go back home and play in my country because I have never been able to win a title there. I want to return to Brazil most of all because of personal reasons but I am still under contract at Chelsea and I have to resolve that. I expect to have my situation resolved before July 26."
Deco joined Chelsea from Barcelona two years ago and played 28 games last season as Carlo Ancelotti's side clinched a Premier League and FA Cup double.