Aston Villa's Bulgarian midfielder Stiliyan Petrov applauds during a lap of honour after the English Premier League football match between Aston Villa and Chelsea at Villa Park in Birmingham, central England on May 11, 2013. Aston Villa captain Stiliyan Petrov used his final programme notes to thank the club's fans for their vocal support as he tries to overcome leukaemia. The Bulgarian midfielder has not played since March 2012, when he was diagnosed with the disease, and earlier this week he announced his retirement from football at the age of 33. AFP PHOTO / PAUL ELLIS 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 PAUL ELLIS/AFP/Getty Images)
