Deco admits he wants to leave Chelsea at the end of the season.
It is another blow to the Blues after defeats to Inter and Manchester City plus the John Terry and Ashley Cole sex scandals.
Deco told The Sun: "I want to go back to Brazil. I still have a couple of good years of high-level football in me but I want to be near my kids."
Deco, 32, has a year left on his Chelsea deal but has asked the club to let him leave.
He added: "Ideally, I'd like to go after the World Cup and I've been talking to Chelsea about it."
Dad-of-four Deco has been a major player under boss Ancelotti, featuring in 24 games this term.
He said: "It will all depend on Chelsea - if the club release me or let me go on loan. I'm not going to rush to choose a new club but it's time to get back."