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They have one big problem they do not play well all the time. In their last five games they have not played well and have lost three times. This has made them fall in rankings. Luckily teams they are competing with Manchester City and Newcastle have also played some bad games. This means Chelsea can still hold onto fourth place for now and try to qualify for UCL. But Chelsea position is not safe and we do not know if they will stay in fourth place. Their next game against Tottenham will be very important and it is hard to predict because Tottenham has not played consistently well this season either.
Yes, it is undeniable that if assessed one by one in its performance, there are several weaknesses of Chelsea that must be improved. Previously, their attack line was quite good, especially with the combination of Cole Palmer and Jackson. However, in the last few matches, its performance has declined quite a bit, unlike at the beginning of the season.
On the other hand, Chelsea's defense is still quite bad, because there is indeed a lack of quality players. Hemm, they often spend a lot of money to buy new players, but not top players that they can rely on