Diego Costa is the villain of the piece again as far as Arsenal fans are concerned. The Chelsea striker was responsible for getting Gabriel Paulista sent off in September’s reverse fixture between the two London rivals, and was today involved in Per Mertesacker’s red card. Referee Mark Clattenburg adjudged that Mertesacker had denied Costa a clear goalscoring opportunity by sliding in on the Spain international as he ran towards Petr Cech’s net on 18 minutes. Watch more brilliant snippets like this with fanatix's FREE sports video news app. While it looks like a blatant red card at first glance, replays show that Mertesacker did not actually make contact with Costa and that the Blues...
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