The 16-year-old Japanese sensation has already played for FC Tokyo and was on the books of Barca.
But he had to leave after they were found guilty of breaching rules on the signing of youth players
And that has led Real Madrid to plot a sensational swoop to stop him returning to the Nou Camp, says Sport.
He is unable to rejoin Barcelona until he turns 18, and Madrid are now planning on attempting to put a stop to that and secure his services instead.
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