Deco says Chelsea will be his last club in Europe.
Deco told RTP: "I've been thinking of returning to Brazil for a while now. But I've realised I can still achieve good things (in Europe).
"I don't want to return for the sake of it. I'm under contract at the moment and I want to be happy to play my football.
"I still have three years left on my contract with Chelsea. If I remain there until the end, it will be my last contract in Europe."