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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.
I would not say that, since what all coaches want is to build a better club and initiate their own idea on the players, that's his one of the significant functions of a coach is to guild the players on the best strategy to adopt, and potters mission to improve Chelsea was a failed one, and even Lampard did not succeed in coaching Chelsea when potter was sacked, and it was getting more difficult for him to control Chelsea but since they have a new coach lets see if his strategy will favor the club.
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.
Since Chelsea is a top club but is broken, I hope Poccetino will be the solution to Chelse's problem and not make it worse because sometimes the solution might be the actual problem still waiting to see the out of his performance. It will take some time before we can actually give Poccetino his due if his doing a good job or not it is all a gradual process.