Trossard has been linked with a move away in January, though Arteta shut down the talk after the Belgian scored in last night's win against Tottenham.
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He laughed: "Yeah, for me, no, because for me it was forbidden for him to leave. No chance. I know the player that he is, and surrounded with the players that we have, he's a player that is going to make a difference for us.
"I fully agree, it was one of the best games, so aggressive with and without the ball, so effective, he could have scored another one or two goals, and he was involved in so many positive actions. So that's what we need.
"As I said, I think individually, the players were excellent today."