Manchester United: Shea Lacey reacts as Champions League debut proves 'final straw' for JJ Gabriel

While Standard Sport understands United have been taken aback by the 15-year-old’s request, details of Gabriel’s decision has come to light.It has also been suggested that this was the ‘final straw’ as Gabriel and his team believe he should've been given that chance ahead of those players, despite being four years younger than both Lacey and Amass.Perhaps by coincidence, Lacey took to social media shortly after the Gabriel news emerged and posted an image of him arriving at Old Trafford with a love heart emoji.On the same day as Lacey’s Champions League debut, Gabriel scored a hat-trick as Man United beat Sabah in the UEFA Youth League.Playing the full 90 minutes at the Progress With Unity Stadium last Thursday, the teenager opened his account on the stroke of half-time before completing his treble with two goals in quick succession late on.This is because the only way for a 15-year-old to play in the Champions League is to be named in a club's 25-man A list of players.United submitted their squad prior to facing Sabah but opted not to put Gabriel on the A list, meaning he was ineligible for United’s return to Europe’s top table following a three-year absence.