The Northern Irish midfielder joined the Reds from Manchester United at U-14 level. He scored in every other game in the U-18s Premier League in the 2023/24 season, 11 goals in total. Morrison who has been compared with Curtis Jones, has been a mainstay of the U-21s in the 2024/25 campaign and his progress was rewarded with a place on the bench in Liverpool's final group stage versus PSV in the Champions League on 29 January 2025.