The Gunners take on Atalanta in the group stages of Europe’s premier club competition.
While they would normally play on Tuesdays or Wednesdays, this game is on a Thursday.
Arteta told reporters: “It’s different but here we are, playing in the Champions League on a Thursday night. It’s different but we’re really happy, motivated and enthusiastic for the first game.
“It’s a really tough place to come, they’ve built something amazing here and it was a beautiful story what they achieved last season. But for us, it is a new season and we really want to kick on in the right way.”
On playing differently in Europe, he added: “Obviously you don’t know the opponents as well and then the boxes become crucial.
“At this level, the small details and moments define the story of the competition and a game. The Premier League is a bit different; in Europe the teams are ruthless and you better be at your best and be very effective.”