I'd been thinking about a 3-5-2, but it feels like it depletes our biggest threat (Saka high up the pitch) to sneak in another forward. So for me, any new formation needs to maintain Saka's role while adding something to help us find more goals and stabilize an increasingly (albeit by fine margins) shaky defense.
On the back of the Man City performance, I also think Arteta needs to show some ruthlessness for at least two of Xhaka, Tomiyasu, and Martinelli....and I would almost include Zinchenko in that. In fact, against a very athletic and counter attacking Villa it may be a good time to test Tierney.
Vs Villa......
Ramsdale
White Saliba Gabriel Tierney
Partey
Ødegaard Xhaka
Saka Nketiah Trossard
and in the short term.....
Ramsdale
White Saliba Gabriel Zinchenko/Tierney
Partey
Ødegaard ESR
Saka Nketiah Martinelli