I watched the UEFA Europa League final game between Atalanta vs Bayer Leverkusen and in my own personal assessment of the game, I think the German club were too confident in that game ahd that cost them the ultimate prize.
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I slightly disagree with your opinion because in my opinion it is quite the opposite.
IMO, it is not Xabi troops who look very confident, but Atalanta who have so much confidence that they can break down the Leverkusen defense and also reduce the mentality of the Leverkusen players.
If someone says Leverkusen looked good in the final match, I slightly disagree because actually Atalanta ball control is far superior with little movement but has fast attacks and Atalanta playing style is like a very experienced team and can always take the ball from Leverkusen.
you can see how when Leverkusen is in control of the ball, then the Atalanta players can easily read the movements of the Leverkusen players and the direction of the ball wherever Atalanta can easily guess and that's all because Leverkusen confidence has dropped greatly after conceding 1 score.
another piece of evidence regarding Leverkusen not having confidence was when Amine Adli and Florian Wirtz got a very good chance but couldn't score and while it was really a very good chance they should have scored some points.
If Leverkusen self confidence and mentality are very high, Florian Wirtz chances will definitely be 1 score and Leverkusen will be able to provide resistance.
but the facts are very bad, right? conceded 3 scores without reply and confidence means nothing for Leverkusen.