Arsenal marched into the Carabao Cup quarter-finals on Wednesday evening, but may have picked up a fresh injury concern in the process.A much-changed Gunners side rallied to respond to a below-par first-half performance - that saw them fail to register a single shot on target and give up a number of chances - with goals from Ethan Nwaneri and Bukayo Saka after the break in a 2-0 victory.