JJ Gabriel has arrived in Barcelona for talks ahead of a potential transfer, talkSPORT understands.Barcelona and Real Madrid are understood to be the most viable options for Gabriel should he pursue a move abroad.Gabriel’s future is up in the air after he asked to leave Manchester UnitedGettyGabriel, 15, is currently on the books at Manchester United, but sensationally asked to leave the club on Tuesday.The Red Devils remain in the dark as to what prompted the teen’s shock request, though they remain hopeful of a resolution.Prior to Gabriel’s plea, he was due to be included in Michael Carrick’s first-team squad for their Carabao Cup tie against Brighton on Wednesday, which they lost 3-2.What has Michael Carrick said about JJ Gabriel’s future?Following the match, Carrick reiterated the need to be ‘careful’ about the situation given Gabriel’s age.“It’s more about the welfare, the care and the attention of JJ as a child really,” Carrick said.“He’s certainly a young man. The situation is what it is, but we have to be careful about the exposure on that one.”The rules that help – and hinder – Gabriel’s moveAlthough United ideally would like to retain Gabriel, they may be powerless to prevent him from going when he turns 16 on October 6 because he possesses an Irish passport.The Irish passport is also key in helping Gabriel get around Brexit rules, which state English players must be 18 to join a team in Europe, unless they are a dual national with an EU country.However, there would be several hurdles that need clearing in order for Gabriel to complete a move to Spain.FIFA rules state that if a player under the age of 17 moves countries, he must provide proof his family are moving to that country for ‘non-footballing reasons’.Carrick will hope the club can keep Gabriel despite his desire to move onGettytalkSPORT understands Gabriel’s family intend to relocate to Spain.This is a developing story and is being updated.For the latest updates, breaking news alerts, and comprehensive analysis, refresh this page or follow our real-time news coverage by watching and listening to talkSPORT live.For broader context, explore related coverage on our homepage for the top trending stories. For the latest talkSPORT videos, download the app.talkSPORT cares about getting it right, not just getting it first and because this is a developing situation, details will change. We will be updating this page constantly with verified info, expert takes, and official statements.Stay tuned for further developments as this story continues to break.