Well, the problems started originally with Graham Potter. His invitation was probably the key mistake because before Chelsea he had no big clubs and the result was average in Chelsea itself at first, but after the purchase of star players it became even worse. Apparently with the arrival of new stars Potter finally lost control.
The invitation of Lampard was also incomprehensible, because before that he had been sacked just because of poor results.
Poccetino has experience working with the most star players, so at least he shouldn't have a problem with discipline. The main thing is to show results in the beginning to return everyone's confidence that Chelsea are still a top club.
In fact, the problem lies with Todd Boehly not Graham Potter. he was only chosen, because other coaches did not want to handle the situation that was facing Chelsea. The thing is, there's a reputation at stake. which in the end, Potter accepted the offer with the risk that was on his shoulders. Initially Chelsea went well under Potter, unfortunately the problem came when there were many Chelsea players who were hit by injuries. at the same time, Chelsea was getting worse and worse so Potter became Todd Boehly's scapegoat. after that, none of the coaches were willing to handle Chelsea which in the end Lampard tried his luck again. with the scenario, if successful his career will recover. unfortunately, under his tutelage everything is getting messy even though Chelsea has brought in many newcomers even with expensive bandrol.
Now, Poccetino is their official coach. he should be able to fix Chelsea back to improve. at least, can compete at the top of the Premier League. because, they do not have a busy schedule like other teams. Well, the new season hasn't started yet, there's a lot of work for the new coach. his current job, releasing players who weren't part of his project. the rest, he can start to build chemistry.