Matthijs de Ligt described Manchester United's loss against Arsenal as "not good enough" but admitted the team are on the road to improving with Ruben Amorim in charge.
United defended well in the first half and limited Arsenal's chances. It was goalless by the interval but it didn't take long in the second half for Arsenal to break the deadlock.
The Gunners have the best set-piece record in the Premier League and took the lead in the 54th minute when Jurrien Timber scored from a corner with a glancing header at the front post.
Arsenal doubled their advantage from another corner - the delivery was to the back post on this occasion - and William Saliba was the scorer.
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