Chelsea's English midfielder Frank Lampard (L) is challenged by West Bromwich Albion's Congolese midfielder Youssouf Mulumbu during the English Premier League football match between Chelsea and West Brom at Stamford Bridge in London on March 2, 2013. AFP PHOTO/OLLY GREENWOOD 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.