I'd question why you're taking pre-season friendlies so seriously, but given what gets put in front of Chelsea every week, it's completely understandable
Conceded two goals in 3three minutes in the second half, Chelsea had over 50% possession, 23 shots 10 of which were on target, and scored one penalty. Celtic had 14 shots 11 on target, 47% possession, and scored 4, Imagine if Celtic had their strongest team
Preseason performance are not definitive but it gives some sense of outlook of the overall team ahead of the new season. With what I have seen from this Chelsea team so far, it has been awful to watch this Chelsea team play. Enzo has to be careful because the league is only going to get harder from here once the league officially starts. I know City lost to Celtics as well but man, that Chelsea loss was embarrassing to say the least.
Enzo needs a win against Club America because those Man city and Madrid games are going to be another magnitude of difficulty.