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The next season champion league tournament will be a very tough one then this season due how so many clubs are prepare for the next coming season, apart from the Manchester city there so much teams that are are going to be tough as you mentioned them earlier expecially, a team like arsenal I'm expecting a good outcome from them. Because since there able to win the champion league this season; they want dominate the entire next coming season, and in my view arsenal can make that happen with how they improve their performance better, But nevertheless let us be wait and see what can actually happen in UEFA Champions league we can't make an early predict.
I think you made a mistake by saying that Arsenal were able to win the Champions League title. They did not win the Champions League either; they performed well. I can deny that fact, and furthermore, Arsenal are in form every season because they just don’t have the spirit of getting the title, which is what happens in the Premier League and Champions League. They both always fail when the season is about to end.
However, every season is tough, and the one coming becomes more tough because many teams have already seen each other's weak points, and they will want to prepare against that and take down any team that will be a challenge for them in the competition, so that’s why any competition gets tougher than the previous season.
Yes, of course, it will be very difficult because big teams always prepare and bring in excellent recruits. For Arsenal, just like last season, they should set specific goals in the Champions League or Premier League. I understand that the current position and strength of the team are not at the level of the illusion of being able to hold all titles even though in theory, that is still within reach. Arsenal is currently lacking a real goalscoring striker, they need to add one in this summer transfer window. Arteta's tactical innovations have led to Arsenal's recent successes. And if Arteta can continue to innovate and think of new ways to beat teams, there's no reason why the Gunners can't win this season.