SPORT, via Liverpool World, gave Alexander-Arnold a 5/10 for his debut and wrote: “Xabi Alonso positioned him inside with the ball, but he never looked comfortable or created any advantage. Physically far from his best, it wasn't the best debut for the Englishman, who also failed to contribute offensively."
Football Espana also gave him the same score, writing: "There has been much talk about Trent Alexander-Arnold ahead of his debut, but it was an underwhelming one. He was not at his best defensively, and he struggled to make an impact in attack before being substituted."
Finally, AS, via Sport Witness, gave him a 'blank rating', with Raul Asencio and Jude Bellingham the only other Madrid players to get that mark. They added that he and fellow summer signing Dean Huijsen have 'much to do' after their debuts, and Alexander-Arnold was signed to ‘terrorise the opposition’ and ‘produce immediately’ - something he fell short of.