I don't see much impressive player being linked with Chelsea recently. I see only really young players being linked and it doesn't look like Chelsea have an aim to change the starting lineup much with new transfers for now. Actually Laporte and Dybala have also been rumoured players to join Chelsea.
But as I can see Dybala transfer is not happening as he wants to stay at Roma. Laporte still has 2 more years on his contract. However he couldn't play much in the previous season. We watched him in the Premier League in only 12 games. His market value is also only 25 million euros. Chelsea might be likely to sign him by not spending too much money I think if they push for him.
Chelsea made "big" transfers last season and looking to get out of that now. They have tried "inject a lot of money quickly and find a way to win" but they have failed that so I think it is going to be tough to do the same thing.
So, instead they are selling the players they have, and getting younger players and hoping that it would work for them in the end. I am not saying that it would be a smart decision or anything like that, I am not saying this is what they should do, all I am stating right now is the current situation. Get rid of superstars that worth a lot of money, and use that money to get young players with some potential and that would be a good thing for the future. I believe it is actually a good idea for sure.