The Brazilian-born Spain international joined the Blues from Atletico Madrid in the summer of 2014 after Jose Mourinho’s side activated his £32 million release clause and convinced him to move to West London.
Costa was instrumental for Atletico last season, scoring 36 goals in 52 appearances in all competitions and helping the club win their first La Liga title since 1996.
His form since making the move to the Premier League has remained consistent as he stands second behind Sergio Aguero in the scoring charts with 12 goals after 16 rounds of fixtures.
Capped as a Spanish international, Costa is widely regarded as one of the deadliest strikers in world football and his contribution throughout 2014 has prompted Deco to name him in his world XI.
“He was the great reference of Atletico Madrid 2014, becoming a champion in Spain and reaching the Champions League final,” Deco told Spanish publication Diario Sport.
“He scored many goals and also added assists. He deserved his move to Jose Mourinho’s Chelsea side and he is becoming a key player for them.”
The West Londoners are certainly making good use of Costa’s ability and his partnership with creative midfield Cesc Fabregas as Mourinho’s side lead the table heading in to the festive period.
Deco, formerly of Barcelona, showed no bias in his decision making as he opted to name just the one Barca star – Messi – while opting to choose four from El Clasico rivals Real Madrid.
Here is Deco’s World XI:
Manuel Neuer, Philipp Lahm, Miranda, Mats Hummels, David Alaba, Luka Modric, Toni Kroos, James Rodriguez, Lionel Messi, Cristiano Ronaldo, Diego Costa.