Moreover, the sight of captain Granit Xhaka swearing at supporters who were booing at him as he left the field with 30 minutes left against Palace served as a clear sign that all was not well at the Emirates.
Speaking on the subject of Emery, Campbell told AFTV's Kevin Campbell Show: "What has Unai Emery done to make us better? I used to back managers, but I don't back managers anymore because it's wrong. When you back managers, you get stuck with that manager. And I don't want to be stuck to any managers.
"I want Arsenal to progress and to be able to go and challenge. I don't see it! So, I am calling out Unai Emery, right now because I am not seeing that.I think we're regressing – in my opinion, Unai Emery, thanks for trying, but we're going to go a different direction.
"The board should be getting him out and getting in someone like an [Massimiliano] Allegri or someone of that ilk. Luis Enrique, I like Luis Enrique – people even mentioned [Mikel] Arteta. What about Patrick Vieira?"