No concern for me. Building a new team takes time.
Fans have unrealistic expectations. Replacing legendary players isn't easy. We have many new players and some coming back after bad injuries. It would be a miracle if we were playing much better, given also that we had a short pre-season. We'll improve, but it will take months. When things click, we'll be quite good.
Btw, I think Pep is making a mistake with Rico and O'Reilly. They may become top players but are not ready to play for a team that aims to win the biggest trophies. Gonzalez should be way ahead of O'Reilly as an option from the bench and Gundogan is still the better player.
Pep loves Rico but when things get serious he drops him. It happened in the previous 3 seasons and it is likely to happen again. Can anyone see Rico starting games for Liverpool, Arsenal or Real?
If we want to have more academy players on the pitch, then chances are we don't compete for the title. Pep is more willing to give chances to youngsters this season and that may be a mistake. Play your best available players.