Son left Spurs for LAFC for a MLS record £20m transfer fee earlier this summer.
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And LAFC chief John Thorrington has revealed the South Korean great is currently the biggest selling shirt in world sport - including the high-profile names in NBA and NFL, plus Inter Miami star Leo Messi.
"This is now the second week where we're not just talking about the highest-selling football jersey in the MLS," Thorrington told talkSPORT.
"It is the highest-selling jersey of any sport in the world right now.
"If you take from when he signed at LAFC to now, he has sold more jerseys than any other athlete in the world."
Thorrington added: "That's the scale of this."