It's normal for people to take the result from the Pre-season match seriously. This was because chelsea recorded worse result compared to the last season in the Pre-season match. Don't you even aware about how easy Wrexham and Celtic pass the defensive line of Chelsea?
Although this is just a pre-season match and maybe many top clubs don't really think about it as a priority or consideration, but, being defeated by a score of 1 - 4 from Celtic, that's quite surprising. At least, the goal gap is only 1, this is 3 goals. Haha
So, we start to think whether Chelsea is really not that serious or Chelsea is really not ready or not ready. Luckily this is just a pre-season so there won't be much commentary on it. And of course some main squads aren't included. But anyway this will be a concern for Marezca as the new coach of Chelsea and this is his first match too.