I will disagree with you that Manchester United's performance was poor last season, if you said Manchester's United performance was poor at the beginning of last season I would agree with you. Last season was one of Manchester United's best seasons and United ended up winning a trophy. Chelsea is the only club that has had a poor performance at the beginning of last season throughout.
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Last season and this season it is clear that Manchester United performance is very different, it is impossible for them to be like last season, being able to occupy the top 4 or even have the opportunity to compete in the UCL.
This season Manchester United is in 8th position with 31 points and has suffered 9 defeats, this is the bad condition that Manchester United has experienced over the last few seasons.
I think that there is no chance for Manchester United this season to be in the top 5 because the difference is almost 10 points to achieve it.
Chelsea had a terrible result in the last season, this season it might be Manchester United' turns.
Chelsea are still the same as they have been in two seasons full of pressure and failure, something similar has happened to Manchester United this season.
They were both Premier League giants in the past but now that they have lost everything, they are two teams full of problems that cannot be resolved.