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Arsenal are unbeaten in their last 18 Champions League games, not including the penalty shootout they lost to PSG last May.
It is the Gunners’ longest unbeaten run in the competition, and there is a very clear reason for it.
Along the way, they have kept 11 clean sheets and conceded just nine goals along the way.
This season in the Premier League, they have let in just five goals in the first nine games, less than anyone in the league.
Mikel Arteta’s side is built on defensive solidarity, and with William Saliba now returning from injury, it will only get stronger.