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We don't know what the problem is even though Chelsea have great players and expensive but failed to reach the best place, maybe the coach's mistake?
The recipe for failure was already there from forcing Abramovich out of the club to the new owner's sacking of Tuchel and changing almost everything so it's not really that we do not know what happened. The problem is above the managerial level and Potter couldn't do much about that in just six months unfortunately.
I will have to agree with you, I was listening to a sports broadcast this morning on a radio, and I heard the sports analyst saying that chelsea right now needs to sign new players, good players, and they themselves know this and have been taking some steps towards it, but unfortunately for them, they don't have the needed resources (money) to complete any signing deal, I personally do not know how true this claim is, but then, if it be true, I think Chelsea's problem is much deeper than we all think, a club can have good players but without funding, such a club is likely to remain stagnant in terms of progression.