The Spain international has found game time hard to come by so far this term, but Thore Haugstad explains why he'll be essential against the Gunners Arsene Wenger will be glad the game coinciding with his 20-year Arsenal anniversary won’t involve a clash with nemesis Jose Mourinho, but there's another villain the Frenchman will have to stomach. An in-form Diego Costa, who will lead the line for Antonio Conte’s men at the Emirates Stadium on Saturday, always poses problems for the Gunners – even more so when Cesc Fabregas is supplying the ammunition.   That, at least, is what recent history indicates: Arsenal haven't beaten Chelsea in nine league games and have gone six without...
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