That is according to Neil Critchley, who has watched with satisfaction as the young Scouser progressed from a promising talent with the U18s to achieving the dream of representing his boyhood team.
Alexander-Arnold's development reached a new level over the course of the two legs with the Premier League leaders, which Liverpool won 5-1 on aggregate to march through to the last four.
Tested repeatedly by the pace and skill of City's all-star attack, both at Anfield and Etihad Stadium, the teenager stood firm and showed composure far beyond his years.
"To be part of a game of that importance and perform the way he did over the two legs I thought was brilliant for him,” U23s boss Critchley told Liverpoolfc.