Francis Coquelin ready for head-to-head battle with Nemanja Matic . Arsenal midfielder has shone since returning from a loan spell at Charlton . Gunners have failed to beat Chelsea since last weekend 's . READ : Jose Mourinho deep down admires what Wenger has established . Jose Mourinho : Fabregas chose Chelsea over Arsenal to win trophies .
Francis Coquelin ready for head-to-head battle with Nemanja Matic . Arsenal midfielder has shone since returning from a loan spell at Charlton . Gunners have failed to beat Chelsea since October 2012 . READ : Jose Mourinho deep down admires what Wenger has established . Jose Mourinho : Fabregas chose Chelsea over Arsenal to win trophies .