Speaking on Sky Sports, Gary Neville said: "Balance in a team is very important. Innovation is fantastic but sometimes something that started as a good idea evolves into something which doesn't work.
"I feel there is that with Arsenal. They will go back to the basics of 4-3-3. Manchester United are decent on the counter-attack but it is a big test for them. Their performances so far this season have been below par.
"If you're below par at the Emirates you will get beaten. Man United have to raise their game, but Arsenal need to sort themselves out too. I'd expect next week Mikel Arteta is going to end that experiment and go with a solid back four."
Arsenal will be looking to redeem themselves after the 2–2 draw against Fulham when they host Man United in the Premier League on Sunday, September 3.
With Manchester City winning all of their three games so far, the Gunners can't really afford to drop points if they are to challenge Pep Guardiola's side for the title.