Representatives of JJ Gabriel demanded that the teenager played at least 20 minutes in games against Sabah FK, Brighton and Bournemouth before beginning talks about signing a scholarship with Manchester United, sources have told ESPN.
Gabriel, 15, has not trained with United since walking out on the club ahead of their Carabao Cup tie with Brighton on Sept. 16.
He is pictured in United's squad photo, which was released on Monday. However, the image was taken nearly a month ago and sources have told ESPN there is little sign of a reconciliation with the club.
Gabriel's representatives believe certain promises made by Man United have also been broken, sources told ESPN.
Gabriel's representatives have been approached by ESPN for comment.
Gabriel, who turns 16 on Tuesday, was due to make his first team debut against Brighton before representatives demanded United cancel his registration over a row about his playing time.
He made his first-team debut in a preseason friendly against Atlético Madrid in the summer, but was omitted from the squad for the Champions League.
Sources have told ESPN that representatives told United he must play at least 20 minutes against Sabah, Brighton and in the Premier League fixture against Bournemouth at Old Trafford on Oct. 25 before entering discussions over a scholarship.
Gabriel could have signed a pre-agreement from his 16th birthday on Oct. 6.
With it looking increasingly likely that Gabriel will leave, United, according to sources, are prepared to take legal action if there is evidence of other clubs approaching Gabriel outside of the rules.
They have yet to receive a formal enquiry.
A number of clubs have been linked with a move including Barcelona and Real Madrid.
Despite a breakdown in relations with Gabriel's camp, sources have told ESPN that they continue to believe Old Trafford is the best place for him to develop.
Club officials have made a number of attempts to check on his well-being since he stopped reporting for training.
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Sources insist they have made every effort to show he has a pathway to the first team, including assigning coaches and specialist staff -- who usually only work with senior players -- to ensure he's prepared for the demands of professional football.
United also accepted a demand from Gabriel to be given the No.77 squad number for this season and petitioned the Premier League on his behalf to allow him to have the name "Gabriel JR" on his shirt.
Sources close to United insist they have prioritised Gabriel's well-being throughout his time at Old Trafford.
There has been a feeling internally that his representatives -- including members of his family -- have been more keen for the forward to break records rather than focus on his long-term development.
United, according to sources, chose not to punish Gabriel when he missed a week of preseason training with the academy before his step up to the first-team because of a feeling that he could not have been solely responsible for the decision.
Sources have told ESPN that there's genuine concern at Old Trafford that Gabriel is not having an influence on decisions which are affecting his career.
