Arenal squeezed through to the Champions League quarter-finals after a penalty shootout win over Porto at the Emirates on Tuesday night.
The Gunners headed into the tie needing to overturn a one-goal deficit from the first-leg and got their goal in the first period through Leandro Trossard.
It was a nervy night in north London as the home side sought a decisive second goal but the Portuguese outfit gave as good as they got.
Ultimately, it was left to spot-kicks and David Raya was the match winner as Mikel Arteta's side progressed to the last-eight for the first time in 14 years.