Former Chelsea playmaker Deco has retired at the age of 35.
The ex-Portugal international made the decision after failing to overcome a series of recent muscle injuries.
He had been contracted to Brazilian club Fluminense.
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Deco won the Champions League with FC Porto and Barcelona before signing for Chelsea in 2008.
Despite being born and raised in Brazil, he obtained Portuguese citizenship and represented Portugal at Euro 2004, World Cup 2006, Euro 2008 and the 2010 World Cup.