The 16-year-old forward has become one of Europe's most closely watched young prospects, but his next destination remains uncertain after he and his family formally requested to leave Old Trafford.
Real Madrid and Barcelona are both interested, while Paris Saint-Germain and Bayern Munich are also monitoring the situation. Reports of Gabriel training in Spain have fuelled speculation about a move to LaLiga, but there has been no confirmed decision from the player or his representatives.
Sky Sports News reported that Gabriel and his family were in no rush to choose their next club, although a move to another European league was increasingly likely.
Gabriel turned 16 in early October, making him eligible to sign a professional contract with a European club, subject to the relevant rules and approvals. His eligibility for an EU passport through his family is also an important factor in the potential move.
Manchester United have attempted to retain the forward and have offered him a scholarship contract. The club's position is complicated by the possibility that he could move abroad, where the compensation payable may differ significantly from the amount United could receive if he joined another English club.
The Guardian reported that United could receive around £350,000 in standard compensation if Gabriel moves abroad, compared with potentially more than £3 million if he joins a domestic rival, alongside a future sell-on clause.
That financial difference helps explain why United are keen to resolve the situation, although compensation is only one part of the decision facing the teenager and his family.
Gabriel's departure would represent a significant loss for Manchester United's academy. The young forward has attracted attention for his performances at youth level and is viewed as a prospect with the potential to progress towards senior football.
However, his immediate future has been complicated by a breakdown in relations with the club over his pathway to first-team opportunities. Reports suggest he has not trained with United since requesting the cancellation of his registration in September.
Chelsea have also been linked with the teenager, but recent reporting has focused primarily on the leading European clubs. United have reportedly considered possible legal action if he moves abroad, although Gabriel's camp is understood to be concentrating on choosing his next destination.
For now, neither Real Madrid nor Barcelona can be described as having secured an advantage. The player's family has yet to announce a decision, leaving several leading clubs waiting to discover where one of Europe's most highly rated teenage forwards will continue his development.