The high expectation on Leverkusen made people putting blame on Alonso for the loss. I think it's an expression of disappointment that makes people find anyone to put the blame on. I think it's indeed unfair to blame Alonso when he was under his own pressure to stay in unbeaten record that forces himself pushing the limit on his team which cause mentally fatigue in the Europa League final.
Anyone putting their blame on Xabi Alonso after the final match that was loss to Atalanta must be joking, like seriously, who does that after what he has done for the club and could only do it for them for the first time in a century since the existence of the club. He made them win the Bundesliga and has the longest unbeaten run in the history of football, it is something they should be appreciative of and not to even of think of the loss in the Europa League final. It was just a loss they incurred when everyone least expected and that doesn’t call for much alarm and blame, he should be given his accolades and not scold for a wonderful season for the club in its entirety.