The signing from Porto is yet to take the pitch with the Gunners after arriving injured.
Arteta said, "We are already trying him in different positions in training, and he's played on the left, right, as a false nine and an attacking midfielder, so it's good. He doesn't want to be locked in any one position, because he's so used to it, and that's a really positive thing for us."
On whether it'll take him time to adapt to the Premier League, Arteta added: "That's a question mark that's very difficult to respond to right now. It might take him now time to get there, depending on who he's playing with and how the game goes - it could take him no time to adapt.
"What I can tell you is that he's doing everything he can to make that process really short."
Arteta also discussed William Saliba's early impact.
"I think he has his feet on the ground, and I don't think that will be an issue. Obviously we have already talked about the expectation that he had already created before when he was on loan, and he was very aware of everything that was happening around him, and we have tried to manage that internally in a really quiet way. I think it's better to stay like this for him because he is 21 years of age and has played one Premier League match.
"The players really like him because he's become a really determined, focused and humble boy that really wants to take this club forward. He is so willing to talk through anything that you want to talk to him about, and his aim is to get better and make the team better."