Arsenal is once again facing an injury crisis ahead of an important run of games as Aaron Ramsey and Mikel Arteta were ruled out of Wednesday’s home game against Galatasaray inthe UEFA Champions League and Sunday’s visit to Chelsea in the Premier League after picking up muscular injuries in Saturday’s 1-1 draw at home to Tottenham Hotspur. Gunners coachArsene Wenger, who is also without Olivier Giroud, Theo Walcott, Mathieu Debuchy and Abou Diaby, remarked that there is “no chance” that either midfielder would beavailable for the trip to Stamford Bridge on Sunday.