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Of course that's hard to say in advance. I mean do the young players from the Arsenal squad have the mentality of winning in the Champions league. The champions league match is a fairly important match that they must focus on next season because if they waste the opportunity then Arsenal will find it difficult to go far in the Champions league.
Even Arsenal have been absent for a long time in the champions league so this season is the most beautiful season for them to show their strength that they have built from the previous season. The arsenal squad is almost an average of young players and they are not experienced enough to play in the champions league, therefore they must be able to work hard in every match they will play. We will wait for the group phase draw which will be held at the end of August.
Next season I won't get Arsenal as one of the strongest candidates in the Champions League, but they deserve to be among the ones that will compete for tickets to the final. Regardless of how long Arsenal have been absent from the Champions League, I think Arsenal can be expected to be one of the teams that will provide great competition next season.
I agree Arsenal can't be said to have a winning mentality yet, but things can change quickly if Arteta is able to increase the confidence of his players over time. Manchester United, Newcastle, Arsenal and Manchester City will represent the Premier League in the Champions League, but only two of the four above seem likely to qualify for the quarter-finals.