The stadium was only half full for the 3-0 loss to Manchester City a fortnight ago and about one third of the seats empty for Sunday's 3-0 win over Watford.
Last week's 2-0 first-leg win over AC Milan in the last-16 stage of UEFA's secondary competition gave Wenger some breathing space, as did the 3-0 home win over Watford in the Premier League, but former Arsenal forward Nicholas claims that the Frenchman is living on borrowed time.
Arsenal won with goals from Henrikh Mkhitaryan and Ramsey in an impressive performance in Italy last week, but Ramsey said that would not matter in the second leg.
Such has been the reordering of things in recent years by Uefa, however, that an English team missing out might not actually be too badly out of pocket if they actually win the Europa League. United found themselves in the similar situation last season, albeit a few weeks further on into the campaign, when José Mourinho made major changes for the visit to Emirates, a game that fell between the two legs of their semi-final against Celta Vigo. We've seen in the first game how good they are.
Arsenal finished in fifth place in the Premier League last term to miss out on a spot in the Champions League.
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Federer and 10th seed Djokovic both came into the tournament seeking to become the first six-time victor of the event. Japan's Kei Nishikori withdrew through illness before playing his opening match of the tournament.
"Consistency is a sign of quality", Wenger said.
Alexandre Lacazette will miss the match following knee surgery, but is expected return to action following the global break.
"We're always playing for those who come and support us; [those] who are really coming and supporting us are real fans".
Arsenal manager Arsene Wenger is anxious by an apparent dip in attendance at the Emirates stadium in recent weeks but said he is confident the team will do "absolutely everything" to win back their fans.