After two tough away trips this week, Arsenal face their biggest challenge yet as they will travel to the Etihad Stadium to face Manchester City. Arsenal recorded a 1-0 victory in their last Premier League outing in an away North London derby against Tottenham, before drawing 0-0 with Atalanta in their opening Champions League game. Man City have had a similar week, beating Brentford 2-1 before a goalless draw with Inter Milan, but Mikel Arteta has pointed out that their schedule was favourable, with both their games at home and on earlier days. Arsenal were unbeaten against Manchester City la…