Real Madrid could land a stunning windfall of €30 million this summer for a player that never played for the club.
Real have recruited ahead of the new season, snapping up Trent Alexander-Arnold from Liverpool and Dean Huijsen from Bournemouth.
Xabi Alonso's side have also signed budding Argentine star Franco Mastantuono and ex-Manchester United left-back Alvaro Carreras.
The club have spent over €150 million (£129 million) during the transfer window but they could recoup €30 million (£26 million) if a rumoured transfer comes to fruition.
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Atletico Madrid have done a slew of transfers themselves this summer and remain in the market for new talent ahead of the window slamming shut.
Alex Baena, David Hancko and Giacomo Raspadori are among the players who have moved to the Metropolitano Stadium.
According to Spanish outlet Marca, Diego Simeone is eyeing a new dribbling winger and has set his sights on Real Sociedad's Takefusa Kubo, who used to be on the books at Real.
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Kubo, who came through Barcelona's famed youth academy, penned a five-year deal with the Spanish giants in the summer of 2019.
At the time of the transfer, which cost €6.5 million (£5.6 million) - he was a shining prospect and was dubbed the 'Japanese Messi'.
Despite his talent and potential, Kubo never played a senior game for Real.
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He enjoyed four separate loan spells away from the Bernabeu, playing for Real Mallorca, Villarreal and Getafe before returning to Mallorca for a another stint.
His performances in Spain impressed Sociedad, who swooped in and secured a permanent deal for Kubo in the summer of 2022.
The 24-year-old, who has scored 23 goals in 137 matches across all competitions for the club, has a release clause of €60 million (£52 million) in his contract
And Real retain a 50 per cent of the player's rights and would thus receive a cool €30 million (£26 million) if the deal goes through which would be a massive boost for their finances.
Topics: Real Madrid, Football, Atletico Madrid
Nasir Jabbar