Deco, who has a year left on his contract with Chelsea, won the Champions League with Porto in 2004 and Barcelona in 2006.
He joined Chelsea in June 2008 when Luiz Felipe Scolari, his former coach with the Portugal team, was in charge at Stamford Bridge.
However, he has struggled for first-team chances due to injuries and patchy form, and missed their recent Premier League and FA Cup Double celebrations.
Deco helped Portugal reach the Euro 2004 final and the 2006 World Cup semi-finals.
They face Brazil, Ivory Coast and North Korea in Group G at the 2010 finals in South Africa starting on 11 June.
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