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Arsenal were 1-0 winners at Brentford as Aaron Ramsdale responded to being controversially dropped by Mikel Arteta.
Reiss Nelson's eighth-minute goal separated the sides despite a Brentford onslaught after the break.
Arteta has preferred David Raya to Ramsdale in goal for the past three games.
But the England international was needed for the Gunners to progress as he produced a brilliant stop to deny Yoane Wissa an equaliser.