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Chelseas Brazilian-born Spanish striker Diego Costa celebrates scoring his team's second goal during the English Premier League football match between Swansea City and Chelsea at The Liberty Stadium in Swansea, south Wales, on January 17, 2015. AFP PHOTO/GEOFF CADDICK == RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR LIVE SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. == (Photo credit should read GEOFF CADDICK/AFP/Getty Images)
Chelseas Brazilian-born Spanish striker Diego Costa celebrates scoring his team's second goal during the English Premier League football match between Swansea City and Chelsea at The Liberty Stadium in Swansea, south Wales, on January 17, 2015. AFP PHOTO/GEOFF CADDICK == RESTRICTED TO EDITORIAL USE. NO USE WITH UNAUTHORIZED AUDIO, VIDEO, DATA, FIXTURE LISTS, CLUB/LEAGUE LOGOS OR LIVE SERVICES. ONLINE IN-MATCH USE LIMITED TO 45 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. == (Photo credit should read GEOFF CADDICK/AFP/Getty Images)

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Can Diego Costa and Chelsea retain the EPL title? CNN's Don Riddell speaks to Chelsea's star striker about their goals for the season.

'Every player wants to conquer': Diego Costa's ambitions

Can Diego Costa and Chelsea retain the EPL title? CNN's Don Riddell speaks to Chelsea's star striker about their goals for the season.