Diego Costa of Chelsea pushes away Laurent Koscielny of Arsenal with his hand in his face near his eyes shortly before Gabriel of Arsenal was sent off. Chelsea v Arsenal, FA Barclays Premier League, Stamford Bridge, London, 19/09/2015 © Matthew Impey/Wiredphotos.co.uk. tel: 07789 130 347 email: matt@wiredphotos.co.uk