In this Champions League, I don't think if we will see a good performance from Haaland because according to the last performances we saw from him in the past he usually has bad performances against the stronger teams.
On the other hand Manchester City in this season lost some players and that's enough to say we can't expect a lot from them.
The Citizens are the reigning Champions of UEFA Champions League and they stand a chance of winning it again if they continue in competitive form. Pep Guardiola is always two steps ahead of his rivals, he already mapped out the negative and positive measures of the club. More reasons they don't encounter challenges and if they do, only a few and they constantly resolved their differences. Manchester City doesn't seem to be shaky with Erling Haaland. We are aware about the competitive form of Manchester City and they don't settle for lesser results, rather they keep brilliant stats against oppositions.