Trossard opened the scoring as Arsenal won 5-0 on Tuesday.
The Belgian later posted to social media: "London is red!"
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Gunners boss Mikel Arteta also encouraged his players to enjoy the win last night: "Great for us obviously and for the confidence and the belief that we can do it as well. That we can come to these stages against big teams and perform and win games the way we've done it tonight.
"Enjoy it and then it's back to work tomorrow because we have a big one on Sunday and we're going to have to prepare really well to beat them."