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They already brought quite a number of new players while releasing more so I don't think it's just an issue of money now. It's essentially a new team if you look at all those transfers and it's kinda expected that they will need more time to work things out. Their form will be the same even if they bought those players you mentioned.
Yes exactly, Chelsea bought several players, and some of them also have high potential and are talented as we can see here
Chelsea transfer.
But, indeed, they are still not able to do their best in the team, this is probably because the new players are still not conformed with the strategy. So, they are not really optimal so far. Some factors are also influencing.
Well, there are some candidates for the new coach that hopefully will bring the right strategy and Chelsea to turn back their performance.
Among them, the most talks are about
Graham Potter, Mauricio Pochettino and Zinedine Zidane