The exciting attacking talent has been working with super agent Pini Zahavi, but has now left his stable ahead of the January market, says Sport.
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The move is seen as a potential blow for Barcelona, which are keen on the 19 year-old.
Watching developments closely are Tottenham, where transfer chiefs Johan Lange and Fabio Paratici have had Rayan scouted regularly this year.
Along with Spurs, Premier League rivals Newcastle and Aston Villa are also interested.