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Chelsea's Brazilian midfielder Willian (L) holds off Sunderland's Dutch defender Patrick van Aanholt during the English Premier League football match between Chelsea and Sunderland at Stamford Bridge in London on December 19, 2015. AFP PHOTO / GLYN KIRK 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 75 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. / AFP / GLYN KIRK (Photo credit should read GLYN KIRK/AFP via Getty Images)

Chelsea's Brazilian midfielder Willian (L) holds off Sunderland's Dutch defender Patrick van Aanholt during the English Premier League football match between Chelsea and Sunderland at Stamford Bridge in London on December 19, 2015. 
AFP PHOTO / GLYN KIRK
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 75 IMAGES, NO VIDEO EMULATION. NO USE IN BETTING, GAMES OR SINGLE CLUB/LEAGUE/PLAYER PUBLICATIONS. / AFP / GLYN KIRK        (Photo credit should read GLYN KIRK/AFP via Getty Images)