Arsenal's Czech goalkeeper Petr Cech watches Arsenal's French defender Laurent Koscielny's attempt hit the bar during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London, England. (AFP Photo/Adrian Dennis)
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Arsenal's Dutch striker Robin Van Persie looks on during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London, England. (AFP Photo/Adrian Dennis)
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Arsenal's Cameroonian midfielder Alex Song (R) chases Chelsea's Ghanaian midfielder Michael Essien (L) during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London. (AFP Photo/Adrian Dennis)
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Arsenal's Robin van Persie, left, fights for the ball with Chelsea's John Terry during their English Premier League soccer match at the Emirates stadium, London. (AP Photo/Sang Tan)
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Chelsea's Spanish striker Fernando Torres (L) crosses the ball during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London. (AFP Photo/Adrian Dennis)
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Chelsea's Italian manager Roberto Di Matteo (L) looks on during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London. (AFP Photo/Adrian Dennis)
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Arsenal's Andre Santos, left, fights for the ball with Chelsea's Fernando Torres during their English Premier League soccer match at the Emirates stadium, London. (AP Photo/Sang Tan)
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Arsenal's French midfielder Abou Diaby (R) and Belgian defender Thomas Vermaelen (2nd R) vie with Chelsea's Ivorian striker Salomon Kalou (L) during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London (AFP Photo/Adrian Dennis)
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Chelsea's Spanish striker Fernando Torres controls the ball during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London. (AFP Photo/Adrian Dennis)
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The assistant referee watches the position of the ball as Chelsea's Ghanaian midfielder Michael Essien (2nd L) vies with Arsenal's Cameroonian midfielder Alex Song (R) during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London. (AFP Photo/Adrian Dennis)
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Arsenal's Theo Walcott lies injured on the pitch during the English Premier League soccer match against Chelsea at the Emirates Stadium, London. The match ended in a 0-0 draw. (AP Photo/Anthony Devlin)
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Arsenal's Dutch striker Robin Van Persie (2nd L) shoots under pressure from Chelsea's English defender John Terry (L), as Chelsea's Czech goalkeeper Petr Cech watches (R) during the English Premier League football match between Arsenal and Chelsea at The Emirates Stadium in north London. (AFP Photo/Adrian Dennis)
