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For next season, Arsenal have also confirmed that they will qualify for the Champions League. Arteta must be able to perform better than last season, but the hardest thing I can imagine is making Arsenal have a winning mentality. Indeed, Arsenal has many players with above average quality, but when it comes to mentality it is difficult to expect them to be successful.
It seems to me that despite the traditions, Bayern had much bigger problems with the winning mentality last season, but they were able to knock Arsenal out of the Champions League.
Even if Arsenal strengthens and becomes the champion of England next season, this will not be a guarantee that they will advance to the Champions League - a difficult opponent may even end up in the 1/8 finals. Moreover, this often does not depend on the club that performs well and is considered seeded - another top club may experience temporary problems and not take first place in the group. Thus, already in the 1/8 there may be a pair where one of the main favorites of the tournament will be eliminated.