Why JJ Gabriel is not in Manchester United squad against Brighton today after major U-turn

At just 15 years of age, Gabriel would have become Man United’s youngest-ever player had he featured against Brighton, beating the record of the late former goalkeeper David Gaskell - who made his debut for United at the age of just 16 years and 19 days against Manchester City in October 1956."I really enjoyed the game. You could see the quality,” Carrick said. "JJ is one of the boys. He's obviously got a really big talent.“He's trained with us quite a bit and is getting experience all the time. He's physically adapting to each step that he makes, and we're just continuing his development."However, following a major U-turn, not only has Gabriel been left out of the matchday squad, his Man United career is in serious doubt after asking the club to cancel his registration so he can become a free agent.Left out: JJ GabrielGettyStandard Sport understands United have been taken aback by Gabriel’s decision but believe they can convince wonderkid to stay at the club despite his shock demand to leave.United are able to challenge Gabriel’s request, while Premier League rules state that all parties - the club, player and their parent or carer - must agree to the cancellation for it to be valid.“During your child’s registration period, their registration may only be cancelled if everyone agrees (the club, player and parent/carer),” the Premier League rules read.Read More“If the parties don’t agree, then any one person involved can also ask the Premier League to provide a binding decision on a termination request.”Gabriel is unable to sign a professional contract until he turns 17, or a scholarship agreement until he turns 16 on October 6.