Pressley felt his Sky Bet League 1 club acquitted themselves well in their 4-0 defeat.
"I was exceptionally proud of that performance. I asked the players to be brave in possession and they truly were," Pressley said.
"Being 2-0 down at the Emirates it's easy to go under, but we got after them and forced them back and were the more likely team to score.
"In the end Arsenal's quality shone through, they tired us out in the last 10 minutes. In the end 4-0 was harsh. We left nothing out on the pitch."
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