Japanese teenager Takefusa Kubo is on the radar of Barcelona and Real Madrid.
Marca says 'Take' was one of the youngsters for whom Barcelona were sanctioned by FIFA for signing underage players.
In June he turns 18 and could leave FC Tokyo for a future in Europe.
Barcelona are working on his return but they are not the only ones, with Real Madrid and PSG having made their interest known to the player's agent.
The teenager is on Los Blancos' radar, but the club maintains that Take has a commitment to Barcelona in the event that he returns to Europe once he has reached the age of 18.