"I'm not sure we'll see another Sonny at Tottenham," Kevin Wimmer, Son Heung-min's close friend and former Spurs team-mate, tells BBC Sport.
"To be at one club - especially one as big as Spurs - for 10 years in this day and age is a very special achievement."
After 454 appearances and 173 goals, Son is moving to pastures new a decade after Mauricio Pochettino brought him to north London from Bayer Leverkusen.
The South Korea forward was the most expensive Asian signing in the Premier League when the then 23-year-old arrived in 2015 in a deal reportedly worth £22.