If I'm being absolutely brutal, these would be the concerns:
Right wing: I think Savio/Bobb are erratic, and neither is top quality right now. Bernardo can play there, but he's physically on the wane. I could see cherki/foden taking the position and sort of rotating with each other, but cherki is also an unknown in the prem. The position is not locked.
The other midfielder: Im not overly impressed by reijnders so far, he's useful around the box but he's not the most physical and gets bullied in challenges, needs to figure that out. In long term he may become top, but won't be this season. I doubt Pep will play foden/cherki in the 8, so the other options become Bernardo/Kovacic/Nico G, all of whom are not top level at this point I think. Reijnders has the shirt, but its feeling like he's going to have a grealish/Mahrez first season where he needs to learn to play with pep, some good moments along with some poor ones.
Right back: Khusanov seems excellent defensively but offers 0 going forward, which means our right winger will always be more isolated and ineffective than our left winger, who will have either o reilly or ait nouri to compliment him. I think a knock on effect of Khusanov every week will be to amplify the right wing situation. Nunes/lewis maybe help that, but are half the defenders Khusanov is, and we will concede goals on that side if they play. I don't think either is the ideal solution and we should have bought a rb, but Khusanov clearly the best option for now.
Rodri: Do we have the actual rodri back, or a lesser version? We don't know right now, and even a lesser rodri is better than the vast majority of midfielders out there, but he might not be able to carry us like he did. I think this is a big question and we'll see how his body holds up.
Goals: We need people other than haaland to score. They didn't really last season. I think foden will, but we still dont have a ton of goals from the wings, nor from most of our midfielders. If haaland scored 40 goals, no problem. If he gets injured or goes through bad form. Might be an issue.