Campbell believes Gunners boss Mikel Arteta is still 'learning on the job', which puts United as frontrunners to take all three points when the teams meet at Old Trafford.
"Everyone must understand that Arteta is learning on the job so he will make mistakes, that's for sure.
"I think the team he picked was a good team and they were strong enough to win the game against Leicester. I just don't think Arsenal are playing well enough right now.
"So, it's not really exposing his inexperience, I just think, it's a situation that Arsenal have to get through and that's all."