Chelsea remain keen on Atletico Madrid striker Diego Costa.

The Daily Star says Spanish sources report Blues officials plan to watch Costa next week, ahead of what could prove to be a busy winter transfer window for the top Premier League clubs.

Chelsea's first chance to watch Costa in action will be when the Spanish winter break ends, with Atletico Madrid facing Malaga on Saturday 4th January.

Blues manager Jose Mourinho is eager to add to his attack in the upcoming window with striking trio Fernando Torres, Samuel Eto'o and Demba Ba failing to hit the back of the net on a regular basis.

Despite signing a new contract in the summer which keeps him at the club until 2018, Costa's form has seen a number of top clubs tracking his progress, including Arsenal.

reports suggest the Gunners have already sent chief scout Steve Rowley to Spain to watch the Brazilian ace in action during Atletico's Copa Del Rey match against Sant Andreu.

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