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Arsenal's English striker Oxlade-Chamberlain (R) sits on the pitch injured before being substituted-off following a heavy tackle during the English League Cup fourth round football match between Sheffield Wednesday and Arsenal at The Hillsborough Stadium in Sheffield, north east England on October 27, 2015. AFP PHOTO / LINDSEY PARNABY 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. (Photo credit should read LINDSEY PARNABY/AFP/Getty Images)

Arsenal's English striker Oxlade-Chamberlain (R) sits on the pitch injured before being substituted-off following a heavy tackle during the English League Cup fourth round football match between Sheffield Wednesday and Arsenal at The Hillsborough Stadium in Sheffield, north east England on October 27, 2015.   AFP PHOTO / LINDSEY PARNABY

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.        (Photo credit should read LINDSEY PARNABY/AFP/Getty Images)