This time we know nothing about Chelsea and this team is totally new in this season because they are going to use a new coach, and those expensive and older players left this team when we could have had some other players, Chslea now got a smaller squad which can make this team a little bit cheaper comparing to the last season and that's why we can say Chelsea in this time got a new team and they are very much hard to be predicted.
We can see how Chelsea performance on some pre season matches. With a new coach and many new players, I think they have started the pre season matches successfully. It indicates that Chelsea have improved their solidity, they also signed the right players that fit with Pochettino's tactics. We all have a big hope for Chelsea to come back to its level again because they already have positive results during the pre season matches.
I don't think Chelsea have a small number of players, there are still 32 players on Chelsea squad. It is more than enough for the number of players, they only focus on local competition. They may need more players if they join international competitions such as UCL or Europa League.