All three teams in Group D can somehow influence Arsenal's fate, but they have not enjoyed a positive weekend.
Arsenal head to Italy in midweek, hoping to clinch a place in the Champions League knockout stages.
A three goal loss away at Napoli however would dump them out, providing Borussia Dortmund win away to Marseille.
While fans should be confident of their own team's abilities to help seal progression, all three teams in their group can effect them positively or negatively in some way, even winless Marseille who could shock Dortmund and hand them a reprieve if Napoli stun them.
However all three sides have endured a forgettable weekend in one way or another, here's how:
Napoli had to make do without key midfielder Marek Hamsik once again through injury, with the Slovak remaining a doubt for the Gunners game. The team were far from impressive at home to Udinese, letting a 2-0 lead slip, and a 3-2 advantage, as they were begged back to draw 3-3. The manner of the result saw Rafa Benitez' side booed off by supporters, while key striker Gonzalo Higuain went 90 minutes without scoring.
It does not look good for Jurgen Klopp's side at present, who if they don't win in Marseille will be a serious crisis. Their Bundesliga title challenge took a terminal blow when they lost 1-0 at home to Bayer Leverkusen, meanwhile rivals Bayern Munich were battering Werder Bremen 7-0. But that wasn't the worst of it; already ravaged by injuries to their defence, midfielder Sven Bender has now been ruled out of the game against Marseille while Nuri Sahin is rated as doubtful.
Over at Marseille it wasn't pretty. They began the weekend by losing 1-0 at home to Nantes, which saw manager Elie Baup immediately sacked. Then there were reports of summer signings Florian Thauvin and Gianelli Imbula having an altercation in the dressing room after the game. Sporting director Jose Anigo has been placed in temporary charge.
image: © ronnie macdonald