The South Korea international announced on Saturday that he will leave Spurs after Sunday's friendly in Seoul against Newcastle United.
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TalkSPORT says Spurs are now in advanced talks with Los Angeles FC over a fee for Son.
Spurs expect to sell Son to LAFC for £15m this week.
For his part, 33 year-old Son is ready to make the move to LA and is now waiting on the two clubs to reach terms.