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The downturn that befell Chelsea due to blunders made by team management, the decision to fire Tuchel was the beginning of Chelsea downfall. After the change of coach, Chelsea appearance did not improve, Potter, who was expected to improve Chelsea performance, failed to meet management expectations which made him the same fate as Tuchel. Chelsea was only able to finish 12th despite having good player material, when compared to the quality of other club squads, Chelsea is included in the list of teams with a luxurious squad after bringing in players at high prices.
Management has appointed Pochettino as the new coach who will lead Chelsea next season, Pochettino will test his squad in pre-season to select players who deserve to be included in the main squad. Player professionalism needs to be tested to improve Chelsea's quality, Pochettino will do various ways to get Chelsea back to competing at the top of the standings.
There was a lot going on at Chelsea during the transition from the old to the new owners. It's something that is normal but the new owner pushed too hard on his desire to appear strong in his first season. Chelsea have good squad depth, of course and they just need a great tactician to make this team play better next season. Pochettino is one coach who is expected to build on Chelsea's form next season, but I place my doubts on him in the title race.
All the top Premier League teams next season are expected to be able to compete strictly for the title, especially Manchester City, Arsenal, Manchester United, but the rest I'm still not sure. Liverpool, Chelsea and Tottenham have to find form again next season, so building that team will take time and it's never going to be easy.