I agree with your opinion about Chelsea. They are one of the most serious contenders of the Premier League title at the moment. It wouldn't be the right thing to overlook them this season. I can still say that they need some transfers now on one hand. For example their biggest need is a striker now as Lukaku is no more here and Werner might also leave the team soon. If they somehow find the right striker for themselves then they would really compete harder to achieve the title.
Chelsea currently seems to be still trying to find defenders and have not thought about buying new players again and if they need a new striker then it will make chelsea waste a very large amount of money, this is a PR for chelsea which they choose to consider with the parties management and as much as possible to find both positions from defender to defense and striker to attack.