Chelsea's English defender Gary Cahill (L) vies with Aston Villa's Congolese-born Belgian striker Christian Benteke (R) during the English Premier League football match between Chelsea and Aston Villa at Stamford Bridge in London, on December 23, 2012. AFP PHOTO/CARL COURT 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.