Asked on how quickly Leandro Trossard made an impact in the Man United game, Arteta said: "That’s what I like.
"I see a player that is willing to make things happen and is especially composed in the final third and is something we needed to add to the team. Straight away he had a beautiful impact on the team to help us to win."
Trossard showed glimpses of things to come with his cameo in the 3-2 win over Man United in the Premier League.
The Belgian should play a part in Friday's FA Cup fourth-round clash with Man City.
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