Barcelona have dropped into the Europa League after finishing third in their respective Champions League group. Their presence has made the competition that much more difficult for Arsenal to win, but the Gunners won't have to play them immediately if they get things right against PSV Eindhoven on Thursday night.
Although Xavi's side still have two matchdays to play in the elite European competition, Inter Milan's 4-0 win over bottom placed Viktoria Plzen on Wednesday evening means that the Catalan outfit have dropped into Europe's second string tournament.
Arsenal fans will be a little worried about them dropping down because the Gunners simply don't have fond memories of playing Barcelona in Europe. After beating them 2-1 in a controversial Champions League final in 2006, the Blaugrana knocked the Gunners out at the Round of 16 stage in 2010, 2011 and 2016.