Arsenal v Chelsea – in pictures

Blue skies over north London as Arsenal prepare to host Chelsea, who will hope to have recovered from their midweek exploits against Barcelona Photograph: Tom Jenkins for the Observer Arsène Wenger watches as Arsenal mascot Gunnersaurus comes off the pitch for the start of the game Photograph: Tom Jenkins for the Observer Robin van Persie waits for the ball to drop for an attempted volley Photograph: Tom Jenkins for the Observer Fernando Torres goes up against Thomas Vermaelen Photograph: Tom Jenkins for the Observer Laurent Koscielny's header hits the bar in the first half Photograph: Tom Jenkins for the Observer José Bosingwa and Theo Walcott both go up for the ball Photograph: Tom Jenkins for the Observer Tomas Rosicky and Florent Malouda both battle for the ball Photograph: Tom Jenkins for the Observer Theo Walcott pulled his hamstring in the second half, adding to Arsenal's injury woes Photograph: Tom Jenkins for the Observer Roberto Di Matteo instructs his players from the touchline Photograph: Tom Jenkins for the Observer A grim-faced Wenger looks towards his players Photograph: Tom Jenkins for the Observer Van Persie agonises after another chance goes begging for the Arsenal captain as he endures a frustrating afternoon in front of goal Photograph: Tom Jenkins