Arteta says he's been delighted with the impact of their new additions.
He wrote: "Each game is going to demand something from you physically, and the spaces you have to attack or protect, and different ways they can play in their build-up as well. So we have to nail that and improve that, and playing against Villarreal will help that, so it’s a good game for us.
"I know it’s going to be the first opportunity for many of you to see our new players in action as well, and we are all very excited about how the squad is shaping up. They have all brought another enthusiasm again, and injected it into the squad. It’s shaken things up.
"They have all been welcomed into the squad by the staff and other players in exactly the way I expected. There have been no surprises there, and many of them were able to get good minutes in their legs while we were out on pre-season tour in Singapore and Hong Kong, so they are developing well ahead of the new season.
"We know what our targets are and what we want to achieve this season. There is a big belief in our ability to achieve that. We’ve been very, very close the last few seasons and the whole team is going to determine whether we achieve that or not."