By Ewan Murray Arsenal need to win to keep their Premier League title hopes alive this Sunday, but old foes Manchester United stand in their way. The Gunners are still vying with Manchester City at the top of the table but have some ground to make up after Pep Guardiola’s side saw off Fulham on Saturday. City are two points ahead and any further slip-ups at this stage could prove fatal. A trip to Old Trafford has always been a mighty challenge for Arsenal historically, but Man Utd are still firmly in crisis mode ahead of their visit this weekend. A 4-0 humiliation at the hands of a resurgent C…